working on mailsever

src/mailserver/Containerfile

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+###
+### Meta Information
+###
+FROM localhost/debian
+
+# deploy options
+# -p (port) and -v (volume) both go host:container
+LABEL deployopts="\
+-p 25:25 \
+-p 465:465 \
+-p 143:143 \
+-p 993:993
+-v /srv/volumes/mailserver/db:/vol/db \
+-v /srv/volumes/mailserver/mail:/vol/mail \
+-v /etc/letsencrypt:/vol/ssl"
+
+# Build Variables
+# uid that the files owner user should have
+ARG FILESUID=5000
+
+###
+### General Setup
+###
+
+# tell debian not to ask any questions during package install
+ARG DEBIAN_FRONTEND=noninteractive
+
+# install packages we want
+RUN apt update -y && apt install -y postfix dovecot-imapd dovecot-lmtpd
+
+# add virtual mail user
+RUN addgroup --gid ${FILESUID:?} vmail && \
+    adduser vmail --ingroup vmail --uid ${FILESUID:?} --disabled-password --gecos "Virtual Mail Owner" --shell /usr/sbin/nologin --no-create-home --home /var/mail/virtual
+
+# copy our custom scripts
+COPY assets/bin /usr/local/bin
+
+###
+### Postfix
+###
+
+# copy postfix config
+COPY assets/main.cf /etc/postfix/main.cf
+
+# make symlink to virtual aliases dir
+RUN cd /etc/postfix && \
+    ln -s /vol/db/aliases.d virtual.d
+
+# copy service override config
+COPY assets/postfix.service.override /etc/systemd/system/postfix.service.d/override.conf
+# reload services to make config take effect
+RUN systemctl daemon-reload
+
+###
+### Dovecot
+###
+
+# copy main dovecot config
+COPY assets/dovecot.conf /etc/dovecot
+# copy dovecot config directory
+COPY assets/dovecot.conf.d /etc/dovecot/conf.d
+
+# make symlink to mail dir
+RUN ln -s /vol/mail /var/mail/virtual

src/mailserver/assets/bin/mkvirtual

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+#!/bin/sh
+
+cd /etc/postfix
+
+cat virtual.d/* > virtual
+
+/usr/sbin/postmap virtual

src/mailserver/assets/dovecot.conf

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+## Dovecot configuration file
+
+# If you're in a hurry, see http://wiki2.dovecot.org/QuickConfiguration
+
+# "doveconf -n" command gives a clean output of the changed settings. Use it
+# instead of copy&pasting files when posting to the Dovecot mailing list.
+
+# '#' character and everything after it is treated as comments. Extra spaces
+# and tabs are ignored. If you want to use either of these explicitly, put the
+# value inside quotes, eg.: key = "# char and trailing whitespace  "
+
+# Most (but not all) settings can be overridden by different protocols and/or
+# source/destination IPs by placing the settings inside sections, for example:
+# protocol imap { }, local 127.0.0.1 { }, remote 10.0.0.0/8 { }
+
+# Default values are shown for each setting, it's not required to uncomment
+# those. These are exceptions to this though: No sections (e.g. namespace {})
+# or plugin settings are added by default, they're listed only as examples.
+# Paths are also just examples with the real defaults being based on configure
+# options. The paths listed here are for configure --prefix=/usr
+# --sysconfdir=/etc --localstatedir=/var
+
+# Enable installed protocols
+!include_try /usr/share/dovecot/protocols.d/*.protocol
+
+# A comma separated list of IPs or hosts where to listen in for connections. 
+# "*" listens in all IPv4 interfaces, "::" listens in all IPv6 interfaces.
+# If you want to specify non-default ports or anything more complex,
+# edit conf.d/master.conf.
+#listen = *, ::
+
+# Base directory where to store runtime data.
+#base_dir = /var/run/dovecot/
+
+# Name of this instance. In multi-instance setup doveadm and other commands
+# can use -i <instance_name> to select which instance is used (an alternative
+# to -c <config_path>). The instance name is also added to Dovecot processes
+# in ps output.
+#instance_name = dovecot
+
+# Greeting message for clients.
+#login_greeting = Dovecot ready.
+
+# Space separated list of trusted network ranges. Connections from these
+# IPs are allowed to override their IP addresses and ports (for logging and
+# for authentication checks). disable_plaintext_auth is also ignored for
+# these networks. Typically you'd specify your IMAP proxy servers here.
+#login_trusted_networks =
+
+# Space separated list of login access check sockets (e.g. tcpwrap)
+#login_access_sockets = 
+
+# With proxy_maybe=yes if proxy destination matches any of these IPs, don't do
+# proxying. This isn't necessary normally, but may be useful if the destination
+# IP is e.g. a load balancer's IP.
+#auth_proxy_self =
+
+# Show more verbose process titles (in ps). Currently shows user name and
+# IP address. Useful for seeing who are actually using the IMAP processes
+# (eg. shared mailboxes or if same uid is used for multiple accounts).
+#verbose_proctitle = no
+
+# Should all processes be killed when Dovecot master process shuts down.
+# Setting this to "no" means that Dovecot can be upgraded without
+# forcing existing client connections to close (although that could also be
+# a problem if the upgrade is e.g. because of a security fix).
+#shutdown_clients = yes
+
+# If non-zero, run mail commands via this many connections to doveadm server,
+# instead of running them directly in the same process.
+#doveadm_worker_count = 0
+# UNIX socket or host:port used for connecting to doveadm server
+#doveadm_socket_path = doveadm-server
+
+# Space separated list of environment variables that are preserved on Dovecot
+# startup and passed down to all of its child processes. You can also give
+# key=value pairs to always set specific settings.
+#import_environment = TZ
+
+##
+## Dictionary server settings
+##
+
+# Dictionary can be used to store key=value lists. This is used by several
+# plugins. The dictionary can be accessed either directly or though a
+# dictionary server. The following dict block maps dictionary names to URIs
+# when the server is used. These can then be referenced using URIs in format
+# "proxy::<name>".
+
+dict {
+  #quota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
+  #expire = sqlite:/etc/dovecot/dovecot-dict-sql.conf.ext
+}
+
+# Most of the actual configuration gets included below. The filenames are
+# first sorted by their ASCII value and parsed in that order. The 00-prefixes
+# in filenames are intended to make it easier to understand the ordering.
+!include conf.d/*.conf
+
+# A config file can also tried to be included without giving an error if
+# it's not found:
+!include_try local.conf
+
+# General settings
+protocols = imap lmtp

src/mailserver/assets/dovecot.conf.d/10-auth.conf

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+##
+## Authentication processes
+##
+
+# Disable LOGIN command and all other plaintext authentications unless
+# SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP
+# matches the local IP (ie. you're connecting from the same computer), the
+# connection is considered secure and plaintext authentication is allowed.
+# See also ssl=required setting.
+#disable_plaintext_auth = yes
+
+# Authentication cache size (e.g. 10M). 0 means it's disabled. Note that
+# bsdauth, PAM and vpopmail require cache_key to be set for caching to be used.
+#auth_cache_size = 0
+# Time to live for cached data. After TTL expires the cached record is no
+# longer used, *except* if the main database lookup returns internal failure.
+# We also try to handle password changes automatically: If user's previous
+# authentication was successful, but this one wasn't, the cache isn't used.
+# For now this works only with plaintext authentication.
+#auth_cache_ttl = 1 hour
+# TTL for negative hits (user not found, password mismatch).
+# 0 disables caching them completely.
+#auth_cache_negative_ttl = 1 hour
+
+# Space separated list of realms for SASL authentication mechanisms that need
+# them. You can leave it empty if you don't want to support multiple realms.
+# Many clients simply use the first one listed here, so keep the default realm
+# first.
+#auth_realms =
+
+# Default realm/domain to use if none was specified. This is used for both
+# SASL realms and appending @domain to username in plaintext logins.
+#auth_default_realm = 
+
+# List of allowed characters in username. If the user-given username contains
+# a character not listed in here, the login automatically fails. This is just
+# an extra check to make sure user can't exploit any potential quote escaping
+# vulnerabilities with SQL/LDAP databases. If you want to allow all characters,
+# set this value to empty.
+#auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@
+
+# Username character translations before it's looked up from databases. The
+# value contains series of from -> to characters. For example "#@/@" means
+# that '#' and '/' characters are translated to '@'.
+#auth_username_translation =
+
+# Username formatting before it's looked up from databases. You can use
+# the standard variables here, eg. %Lu would lowercase the username, %n would
+# drop away the domain if it was given, or "%n-AT-%d" would change the '@' into
+# "-AT-". This translation is done after auth_username_translation changes.
+#auth_username_format = %Lu
+
+# If you want to allow master users to log in by specifying the master
+# username within the normal username string (ie. not using SASL mechanism's
+# support for it), you can specify the separator character here. The format
+# is then <username><separator><master username>. UW-IMAP uses "*" as the
+# separator, so that could be a good choice.
+#auth_master_user_separator =
+
+# Username to use for users logging in with ANONYMOUS SASL mechanism
+#auth_anonymous_username = anonymous
+
+# Maximum number of dovecot-auth worker processes. They're used to execute
+# blocking passdb and userdb queries (eg. MySQL and PAM). They're
+# automatically created and destroyed as needed.
+#auth_worker_max_count = 30
+
+# Host name to use in GSSAPI principal names. The default is to use the
+# name returned by gethostname(). Use "$ALL" (with quotes) to allow all keytab
+# entries.
+#auth_gssapi_hostname =
+
+# Kerberos keytab to use for the GSSAPI mechanism. Will use the system
+# default (usually /etc/krb5.keytab) if not specified. You may need to change
+# the auth service to run as root to be able to read this file.
+#auth_krb5_keytab = 
+
+# Do NTLM and GSS-SPNEGO authentication using Samba's winbind daemon and
+# ntlm_auth helper. <doc/wiki/Authentication/Mechanisms/Winbind.txt>
+#auth_use_winbind = no
+
+# Path for Samba's ntlm_auth helper binary.
+#auth_winbind_helper_path = /usr/bin/ntlm_auth
+
+# Time to delay before replying to failed authentications.
+#auth_failure_delay = 2 secs
+
+# Require a valid SSL client certificate or the authentication fails.
+#auth_ssl_require_client_cert = no
+
+# Take the username from client's SSL certificate, using 
+# X509_NAME_get_text_by_NID() which returns the subject's DN's
+# CommonName. 
+#auth_ssl_username_from_cert = no
+
+# Space separated list of wanted authentication mechanisms:
+#   plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi otp skey
+#   gss-spnego
+# NOTE: See also disable_plaintext_auth setting.
+# Outlook Express and Windows Mail works only with LOGIN mechanism, not the standard PLAIN:
+auth_mechanisms = plain login
+
+##
+## Password and user databases
+##
+
+#
+# Password database is used to verify user's password (and nothing more).
+# You can have multiple passdbs and userdbs. This is useful if you want to
+# allow both system users (/etc/passwd) and virtual users to login without
+# duplicating the system users into virtual database.
+#
+# <doc/wiki/PasswordDatabase.txt>
+#
+# User database specifies where mails are located and what user/group IDs
+# own them. For single-UID configuration use "static" userdb.
+#
+# <doc/wiki/UserDatabase.txt>
+
+passdb {
+  driver = passwd-file
+  # username_format: Set to '%u' to look up full usernames. If you want to enable
+  # user@domain logins but have only user in the file, set to %n instead.
+  args = username_format=%n /etc/dovecot/users
+}
+
+userdb {
+  driver = static
+  args = uid=vmail gid=vmail home=/var/mail/virtual/%n
+}

src/mailserver/assets/dovecot.conf.d/10-mail.conf

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+##
+## Mailbox locations and namespaces
+##
+
+# Location for users' mailboxes. The default is empty, which means that Dovecot
+# tries to find the mailboxes automatically. This won't work if the user
+# doesn't yet have any mail, so you should explicitly tell Dovecot the full
+# location.
+#
+# If you're using mbox, giving a path to the INBOX file (eg. /var/mail/%u)
+# isn't enough. You'll also need to tell Dovecot where the other mailboxes are
+# kept. This is called the "root mail directory", and it must be the first
+# path given in the mail_location setting.
+#
+# There are a few special variables you can use, eg.:
+#
+#   %u - username
+#   %n - user part in user@domain, same as %u if there's no domain
+#   %d - domain part in user@domain, empty if there's no domain
+#   %h - home directory
+#
+# See doc/wiki/Variables.txt for full list. Some examples:
+#
+#   mail_location = maildir:~/Maildir
+#   mail_location = mbox:~/mail:INBOX=/var/mail/%u
+#   mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n
+#
+# <doc/wiki/MailLocation.txt>
+#
+mail_location = maildir:~/Maildir:LAYOUT=fs
+
+# If you need to set multiple mailbox locations or want to change default
+# namespace settings, you can do it by defining namespace sections.
+#
+# You can have private, shared and public namespaces. Private namespaces
+# are for user's personal mails. Shared namespaces are for accessing other
+# users' mailboxes that have been shared. Public namespaces are for shared
+# mailboxes that are managed by sysadmin. If you create any shared or public
+# namespaces you'll typically want to enable ACL plugin also, otherwise all
+# users can access all the shared mailboxes, assuming they have permissions
+# on filesystem level to do so.
+namespace inbox {
+  # Namespace type: private, shared or public
+  #type = private
+
+  # Hierarchy separator to use. You should use the same separator for all
+  # namespaces or some clients get confused. '/' is usually a good one.
+  # The default however depends on the underlying mail storage format.
+  #separator = 
+
+  # Prefix required to access this namespace. This needs to be different for
+  # all namespaces. For example "Public/".
+  #prefix = 
+
+  # Physical location of the mailbox. This is in same format as
+  # mail_location, which is also the default for it.
+  #location =
+
+  # There can be only one INBOX, and this setting defines which namespace
+  # has it.
+  inbox = yes
+
+  # If namespace is hidden, it's not advertised to clients via NAMESPACE
+  # extension. You'll most likely also want to set list=no. This is mostly
+  # useful when converting from another server with different namespaces which
+  # you want to deprecate but still keep working. For example you can create
+  # hidden namespaces with prefixes "~/mail/", "~%u/mail/" and "mail/".
+  #hidden = no
+
+  # Show the mailboxes under this namespace with LIST command. This makes the
+  # namespace visible for clients that don't support NAMESPACE extension.
+  # "children" value lists child mailboxes, but hides the namespace prefix.
+  #list = yes
+
+  # Namespace handles its own subscriptions. If set to "no", the parent
+  # namespace handles them (empty prefix should always have this as "yes")
+  #subscriptions = yes
+
+  # See 15-mailboxes.conf for definitions of special mailboxes.
+}
+
+# Example shared namespace configuration
+#namespace {
+  #type = shared
+  #separator = /
+
+  # Mailboxes are visible under "shared/user@domain/"
+  # %%n, %%d and %%u are expanded to the destination user.
+  #prefix = shared/%%u/
+
+  # Mail location for other users' mailboxes. Note that %variables and ~/
+  # expands to the logged in user's data. %%n, %%d, %%u and %%h expand to the
+  # destination user's data.
+  #location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
+
+  # Use the default namespace for saving subscriptions.
+  #subscriptions = no
+
+  # List the shared/ namespace only if there are visible shared mailboxes.
+  #list = children
+#}
+# Should shared INBOX be visible as "shared/user" or "shared/user/INBOX"?
+#mail_shared_explicit_inbox = no
+
+# System user and group used to access mails. If you use multiple, userdb
+# can override these by returning uid or gid fields. You can use either numbers
+# or names. <doc/wiki/UserIds.txt>
+#mail_uid =
+#mail_gid =
+
+# Group to enable temporarily for privileged operations. Currently this is
+# used only with INBOX when either its initial creation or dotlocking fails.
+# Typically this is set to "mail" to give access to /var/mail.
+mail_privileged_group = mail
+
+# Grant access to these supplementary groups for mail processes. Typically
+# these are used to set up access to shared mailboxes. Note that it may be
+# dangerous to set these if users can create symlinks (e.g. if "mail" group is
+# set here, ln -s /var/mail ~/mail/var could allow a user to delete others'
+# mailboxes, or ln -s /secret/shared/box ~/mail/mybox would allow reading it).
+#mail_access_groups =
+
+# Allow full filesystem access to clients. There's no access checks other than
+# what the operating system does for the active UID/GID. It works with both
+# maildir and mboxes, allowing you to prefix mailboxes names with eg. /path/
+# or ~user/.
+#mail_full_filesystem_access = no
+
+# Dictionary for key=value mailbox attributes. This is used for example by
+# URLAUTH and METADATA extensions.
+#mail_attribute_dict =
+
+# A comment or note that is associated with the server. This value is
+# accessible for authenticated users through the IMAP METADATA server
+# entry "/shared/comment". 
+#mail_server_comment = ""
+
+# Indicates a method for contacting the server administrator. According to
+# RFC 5464, this value MUST be a URI (e.g., a mailto: or tel: URL), but that
+# is currently not enforced. Use for example mailto:admin@example.com. This
+# value is accessible for authenticated users through the IMAP METADATA server
+# entry "/shared/admin".
+#mail_server_admin = 
+
+##
+## Mail processes
+##
+
+# Don't use mmap() at all. This is required if you store indexes to shared
+# filesystems (NFS or clustered filesystem).
+#mmap_disable = no
+
+# Rely on O_EXCL to work when creating dotlock files. NFS supports O_EXCL
+# since version 3, so this should be safe to use nowadays by default.
+#dotlock_use_excl = yes
+
+# When to use fsync() or fdatasync() calls:
+#   optimized (default): Whenever necessary to avoid losing important data
+#   always: Useful with e.g. NFS when write()s are delayed
+#   never: Never use it (best performance, but crashes can lose data)
+#mail_fsync = optimized
+
+# Locking method for index files. Alternatives are fcntl, flock and dotlock.
+# Dotlocking uses some tricks which may create more disk I/O than other locking
+# methods. NFS users: flock doesn't work, remember to change mmap_disable.
+#lock_method = fcntl
+
+# Directory where mails can be temporarily stored. Usually it's used only for
+# mails larger than >= 128 kB. It's used by various parts of Dovecot, for
+# example LDA/LMTP while delivering large mails or zlib plugin for keeping
+# uncompressed mails.
+#mail_temp_dir = /tmp
+
+# Valid UID range for users, defaults to 500 and above. This is mostly
+# to make sure that users can't log in as daemons or other system users.
+# Note that denying root logins is hardcoded to dovecot binary and can't
+# be done even if first_valid_uid is set to 0.
+#first_valid_uid = 500
+#last_valid_uid = 0
+
+# Valid GID range for users, defaults to non-root/wheel. Users having
+# non-valid GID as primary group ID aren't allowed to log in. If user
+# belongs to supplementary groups with non-valid GIDs, those groups are
+# not set.
+#first_valid_gid = 1
+#last_valid_gid = 0
+
+# Maximum allowed length for mail keyword name. It's only forced when trying
+# to create new keywords.
+#mail_max_keyword_length = 50
+
+# ':' separated list of directories under which chrooting is allowed for mail
+# processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar too).
+# This setting doesn't affect login_chroot, mail_chroot or auth chroot
+# settings. If this setting is empty, "/./" in home dirs are ignored.
+# WARNING: Never add directories here which local users can modify, that
+# may lead to root exploit. Usually this should be done only if you don't
+# allow shell access for users. <doc/wiki/Chrooting.txt>
+#valid_chroot_dirs = 
+
+# Default chroot directory for mail processes. This can be overridden for
+# specific users in user database by giving /./ in user's home directory
+# (eg. /home/./user chroots into /home). Note that usually there is no real
+# need to do chrooting, Dovecot doesn't allow users to access files outside
+# their mail directory anyway. If your home directories are prefixed with
+# the chroot directory, append "/." to mail_chroot. <doc/wiki/Chrooting.txt>
+#mail_chroot = 
+
+# UNIX socket path to master authentication server to find users.
+# This is used by imap (for shared users) and lda.
+#auth_socket_path = /var/run/dovecot/auth-userdb
+
+# Directory where to look up mail plugins.
+#mail_plugin_dir = /usr/lib/dovecot/modules
+
+# Space separated list of plugins to load for all services. Plugins specific to
+# IMAP, LDA, etc. are added to this list in their own .conf files.
+#mail_plugins = 
+
+##
+## Mailbox handling optimizations
+##
+
+# Mailbox list indexes can be used to optimize IMAP STATUS commands. They are
+# also required for IMAP NOTIFY extension to be enabled.
+#mailbox_list_index = yes
+
+# Trust mailbox list index to be up-to-date. This reduces disk I/O at the cost
+# of potentially returning out-of-date results after e.g. server crashes.
+# The results will be automatically fixed once the folders are opened.
+#mailbox_list_index_very_dirty_syncs = yes
+
+# Should INBOX be kept up-to-date in the mailbox list index? By default it's
+# not, because most of the mailbox accesses will open INBOX anyway.
+#mailbox_list_index_include_inbox = no
+
+# The minimum number of mails in a mailbox before updates are done to cache
+# file. This allows optimizing Dovecot's behavior to do less disk writes at
+# the cost of more disk reads.
+#mail_cache_min_mail_count = 0
+
+# When IDLE command is running, mailbox is checked once in a while to see if
+# there are any new mails or other changes. This setting defines the minimum
+# time to wait between those checks. Dovecot can also use inotify and
+# kqueue to find out immediately when changes occur.
+#mailbox_idle_check_interval = 30 secs
+
+# Save mails with CR+LF instead of plain LF. This makes sending those mails
+# take less CPU, especially with sendfile() syscall with Linux and FreeBSD.
+# But it also creates a bit more disk I/O which may just make it slower.
+# Also note that if other software reads the mboxes/maildirs, they may handle
+# the extra CRs wrong and cause problems.
+#mail_save_crlf = no
+
+# Max number of mails to keep open and prefetch to memory. This only works with
+# some mailbox formats and/or operating systems.
+#mail_prefetch_count = 0
+
+# How often to scan for stale temporary files and delete them (0 = never).
+# These should exist only after Dovecot dies in the middle of saving mails.
+#mail_temp_scan_interval = 1w
+
+# How many slow mail accesses sorting can perform before it returns failure.
+# With IMAP the reply is: NO [LIMIT] Requested sort would have taken too long.
+# The untagged SORT reply is still returned, but it's likely not correct.
+#mail_sort_max_read_count = 0
+
+protocol !indexer-worker {
+  # If folder vsize calculation requires opening more than this many mails from
+  # disk (i.e. mail sizes aren't in cache already), return failure and finish
+  # the calculation via indexer process. Disabled by default. This setting must
+  # be 0 for indexer-worker processes.
+  #mail_vsize_bg_after_count = 0
+}
+
+##
+## Maildir-specific settings
+##
+
+# By default LIST command returns all entries in maildir beginning with a dot.
+# Enabling this option makes Dovecot return only entries which are directories.
+# This is done by stat()ing each entry, so it causes more disk I/O.
+# (For systems setting struct dirent->d_type, this check is free and it's
+# done always regardless of this setting)
+#maildir_stat_dirs = no
+
+# When copying a message, do it with hard links whenever possible. This makes
+# the performance much better, and it's unlikely to have any side effects.
+#maildir_copy_with_hardlinks = yes
+
+# Assume Dovecot is the only MUA accessing Maildir: Scan cur/ directory only
+# when its mtime changes unexpectedly or when we can't find the mail otherwise.
+#maildir_very_dirty_syncs = no
+
+# If enabled, Dovecot doesn't use the S=<size> in the Maildir filenames for
+# getting the mail's physical size, except when recalculating Maildir++ quota.
+# This can be useful in systems where a lot of the Maildir filenames have a
+# broken size. The performance hit for enabling this is very small.
+#maildir_broken_filename_sizes = no
+
+# Always move mails from new/ directory to cur/, even when the \Recent flags
+# aren't being reset.
+#maildir_empty_new = no
+
+##
+## mbox-specific settings
+##
+
+# Which locking methods to use for locking mbox. There are four available:
+#  dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe
+#           solution. If you want to use /var/mail/ like directory, the users
+#           will need write access to that directory.
+#  dotlock_try: Same as dotlock, but if it fails because of permissions or
+#               because there isn't enough disk space, just skip it.
+#  fcntl  : Use this if possible. Works with NFS too if lockd is used.
+#  flock  : May not exist in all systems. Doesn't work with NFS.
+#  lockf  : May not exist in all systems. Doesn't work with NFS.
+#
+# You can use multiple locking methods; if you do the order they're declared
+# in is important to avoid deadlocks if other MTAs/MUAs are using multiple
+# locking methods as well. Some operating systems don't allow using some of
+# them simultaneously.
+#
+# The Debian value for mbox_write_locks differs from upstream Dovecot. It is
+# changed to be compliant with Debian Policy (section 11.6) for NFS safety.
+#       Dovecot: mbox_write_locks = dotlock fcntl
+#       Debian:  mbox_write_locks = fcntl dotlock
+#
+#mbox_read_locks = fcntl
+#mbox_write_locks = fcntl dotlock
+
+# Maximum time to wait for lock (all of them) before aborting.
+#mbox_lock_timeout = 5 mins
+
+# If dotlock exists but the mailbox isn't modified in any way, override the
+# lock file after this much time.
+#mbox_dotlock_change_timeout = 2 mins
+
+# When mbox changes unexpectedly we have to fully read it to find out what
+# changed. If the mbox is large this can take a long time. Since the change
+# is usually just a newly appended mail, it'd be faster to simply read the
+# new mails. If this setting is enabled, Dovecot does this but still safely
+# fallbacks to re-reading the whole mbox file whenever something in mbox isn't
+# how it's expected to be. The only real downside to this setting is that if
+# some other MUA changes message flags, Dovecot doesn't notice it immediately.
+# Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK 
+# commands.
+#mbox_dirty_syncs = yes
+
+# Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE,
+# EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored.
+#mbox_very_dirty_syncs = no
+
+# Delay writing mbox headers until doing a full write sync (EXPUNGE and CHECK
+# commands and when closing the mailbox). This is especially useful for POP3
+# where clients often delete all mails. The downside is that our changes
+# aren't immediately visible to other MUAs.
+#mbox_lazy_writes = yes
+
+# If mbox size is smaller than this (e.g. 100k), don't write index files.
+# If an index file already exists it's still read, just not updated.
+#mbox_min_index_size = 0
+
+# Mail header selection algorithm to use for MD5 POP3 UIDLs when
+# pop3_uidl_format=%m. For backwards compatibility we use apop3d inspired
+# algorithm, but it fails if the first Received: header isn't unique in all
+# mails. An alternative algorithm is "all" that selects all headers.
+#mbox_md5 = apop3d
+
+##
+## mdbox-specific settings
+##
+
+# Maximum dbox file size until it's rotated.
+#mdbox_rotate_size = 10M
+
+# Maximum dbox file age until it's rotated. Typically in days. Day begins
+# from midnight, so 1d = today, 2d = yesterday, etc. 0 = check disabled.
+#mdbox_rotate_interval = 0
+
+# When creating new mdbox files, immediately preallocate their size to
+# mdbox_rotate_size. This setting currently works only in Linux with some
+# filesystems (ext4, xfs).
+#mdbox_preallocate_space = no
+
+##
+## Mail attachments
+##
+
+# sdbox and mdbox support saving mail attachments to external files, which
+# also allows single instance storage for them. Other backends don't support
+# this for now.
+
+# Directory root where to store mail attachments. Disabled, if empty.
+#mail_attachment_dir =
+
+# Attachments smaller than this aren't saved externally. It's also possible to
+# write a plugin to disable saving specific attachments externally.
+#mail_attachment_min_size = 128k
+
+# Filesystem backend to use for saving attachments:
+#  posix : No SiS done by Dovecot (but this might help FS's own deduplication)
+#  sis posix : SiS with immediate byte-by-byte comparison during saving
+#  sis-queue posix : SiS with delayed comparison and deduplication
+#mail_attachment_fs = sis posix
+
+# Hash format to use in attachment filenames. You can add any text and
+# variables: %{md4}, %{md5}, %{sha1}, %{sha256}, %{sha512}, %{size}.
+# Variables can be truncated, e.g. %{sha256:80} returns only first 80 bits
+#mail_attachment_hash = %{sha1}
+
+# Settings to control adding $HasAttachment or $HasNoAttachment keywords.
+# By default, all MIME parts with Content-Disposition=attachment, or inlines
+# with filename parameter are consired attachments.
+#   add-flags-on-save - Add the keywords when saving new mails.
+#   content-type=type or !type - Include/exclude content type. Excluding will
+#     never consider the matched MIME part as attachment. Including will only
+#     negate an exclusion (e.g. content-type=!foo/* content-type=foo/bar).
+#   exclude-inlined - Exclude any Content-Disposition=inline MIME part.
+#mail_attachment_detection_options =

src/mailserver/assets/dovecot.conf.d/10-master.conf

@@ -0,0 +1,130 @@
+#default_process_limit = 100
+#default_client_limit = 1000
+
+# Default VSZ (virtual memory size) limit for service processes. This is mainly
+# intended to catch and kill processes that leak memory before they eat up
+# everything.
+#default_vsz_limit = 256M
+
+# Login user is internally used by login processes. This is the most untrusted
+# user in Dovecot system. It shouldn't have access to anything at all.
+#default_login_user = dovenull
+
+# Internal user is used by unprivileged processes. It should be separate from
+# login user, so that login processes can't disturb other processes.
+#default_internal_user = dovecot
+
+service imap-login {
+  inet_listener imap {
+    port = 143
+  }
+  inet_listener imaps {
+    port = 993
+    ssl = yes
+  }
+
+  # Number of connections to handle before starting a new process. Typically
+  # the only useful values are 0 (unlimited) or 1. 1 is more secure, but 0
+  # is faster. <doc/wiki/LoginProcess.txt>
+  #service_count = 1
+
+  # Number of processes to always keep waiting for more connections.
+  #process_min_avail = 0
+
+  # If you set service_count=0, you probably need to grow this.
+  #vsz_limit = $default_vsz_limit
+}
+
+service pop3-login {
+  inet_listener pop3 {
+    #port = 110
+  }
+  inet_listener pop3s {
+    #port = 995
+    #ssl = yes
+  }
+}
+
+service submission-login {
+  inet_listener submission {
+    #port = 587
+  }
+}
+
+service lmtp {
+  user = vmail
+  #process_min_avail = 5
+  unix_listener /var/spool/postfix/private/dovecot-lmtp {
+   group = postfix
+   mode = 0600
+   user = postfix
+  }
+}
+
+service imap {
+  # Most of the memory goes to mmap()ing files. You may need to increase this
+  # limit if you have huge mailboxes.
+  #vsz_limit = $default_vsz_limit
+
+  # Max. number of IMAP processes (connections)
+  #process_limit = 1024
+}
+
+service pop3 {
+  # Max. number of POP3 processes (connections)
+  #process_limit = 1024
+}
+
+service submission {
+  # Max. number of SMTP Submission processes (connections)
+  #process_limit = 1024
+}
+
+service auth {
+  # auth_socket_path points to this userdb socket by default. It's typically
+  # used by dovecot-lda, doveadm, possibly imap process, etc. Users that have
+  # full permissions to this socket are able to get a list of all usernames and
+  # get the results of everyone's userdb lookups.
+  #
+  # The default 0666 mode allows anyone to connect to the socket, but the
+  # userdb lookups will succeed only if the userdb returns an "uid" field that
+  # matches the caller process's UID. Also if caller's uid or gid matches the
+  # socket's uid or gid the lookup succeeds. Anything else causes a failure.
+  #
+  # To give the caller full permissions to lookup all users, set the mode to
+  # something else than 0666 and Dovecot lets the kernel enforce the
+  # permissions (e.g. 0777 allows everyone full permissions).
+  unix_listener auth-userdb {
+    #mode = 0666
+    #user = 
+    #group = 
+  }
+
+  # Postfix smtp-auth
+  unix_listener /var/spool/postfix/private/auth {
+    mode = 0666
+    # Assuming the default Postfix user and group
+    user = postfix
+    group = postfix  
+  }
+
+  # Auth process is run as this user.
+  #user = $default_internal_user
+}
+
+service auth-worker {
+  # Auth worker process is run as root by default, so that it can access
+  # /etc/shadow. If this isn't necessary, the user should be changed to
+  # $default_internal_user.
+  #user = root
+}
+
+service dict {
+  # If dict proxy is used, mail processes should have access to its socket.
+  # For example: mode=0660, group=vmail and global mail_access_groups=vmail
+  unix_listener dict {
+    #mode = 0600
+    #user = 
+    #group = 
+  }
+}

src/mailserver/assets/dovecot.conf.d/10-ssl.conf

@@ -0,0 +1,75 @@
+##
+## SSL settings
+##
+
+# SSL/TLS support: yes, no, required. <doc/wiki/SSL.txt>
+ssl = yes
+
+# PEM encoded X.509 SSL/TLS certificate and private key. They're opened before
+# dropping root privileges, so keep the key file unreadable by anyone but
+# root. Included doc/mkcert.sh can be used to easily generate self-signed
+# certificate, just make sure to update the domains in dovecot-openssl.cnf
+ssl_cert = </etc/dovecot/private/dovecot.pem
+ssl_key = </etc/dovecot/private/dovecot.key
+
+# If key file is password protected, give the password here. Alternatively
+# give it when starting dovecot with -p parameter. Since this file is often
+# world-readable, you may want to place this setting instead to a different
+# root owned 0600 file by using ssl_key_password = <path.
+#ssl_key_password =
+
+# PEM encoded trusted certificate authority. Set this only if you intend to use
+# ssl_verify_client_cert=yes. The file should contain the CA certificate(s)
+# followed by the matching CRL(s). (e.g. ssl_ca = </etc/ssl/certs/ca.pem)
+#ssl_ca = 
+
+# Require that CRL check succeeds for client certificates.
+#ssl_require_crl = yes
+
+# Directory and/or file for trusted SSL CA certificates. These are used only
+# when Dovecot needs to act as an SSL client (e.g. imapc backend or
+# submission service). The directory is usually /etc/ssl/certs in
+# Debian-based systems and the file is /etc/pki/tls/cert.pem in
+# RedHat-based systems.
+ssl_client_ca_dir = /etc/ssl/certs
+#ssl_client_ca_file =
+
+# Request client to send a certificate. If you also want to require it, set
+# auth_ssl_require_client_cert=yes in auth section.
+#ssl_verify_client_cert = no
+
+# Which field from certificate to use for username. commonName and
+# x500UniqueIdentifier are the usual choices. You'll also need to set
+# auth_ssl_username_from_cert=yes.
+#ssl_cert_username_field = commonName
+
+# SSL DH parameters
+# Generate new params with `openssl dhparam -out /etc/dovecot/dh.pem 4096`
+# Or migrate from old ssl-parameters.dat file with the command dovecot
+# gives on startup when ssl_dh is unset.
+ssl_dh = </usr/share/dovecot/dh.pem
+
+# Minimum SSL protocol version to use. Potentially recognized values are SSLv3,
+# TLSv1, TLSv1.1, and TLSv1.2, depending on the OpenSSL version used.
+#ssl_min_protocol = TLSv1
+
+# SSL ciphers to use, the default is:
+#ssl_cipher_list = ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH
+# To disable non-EC DH, use:
+#ssl_cipher_list = ALL:!DH:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH
+
+# Colon separated list of elliptic curves to use. Empty value (the default)
+# means use the defaults from the SSL library. P-521:P-384:P-256 would be an
+# example of a valid value.
+#ssl_curve_list =
+
+# Prefer the server's order of ciphers over client's.
+#ssl_prefer_server_ciphers = no
+
+# SSL crypto device to use, for valid values run "openssl engine"
+#ssl_crypto_device =
+
+# SSL extra options. Currently supported options are:
+#   compression - Enable compression.
+#   no_ticket - Disable SSL session tickets.
+#ssl_options =

src/mailserver/assets/dovecot.conf.d/15-mailboxes.conf

@@ -0,0 +1,78 @@
+##
+## Mailbox definitions
+##
+
+# Each mailbox is specified in a separate mailbox section. The section name
+# specifies the mailbox name. If it has spaces, you can put the name
+# "in quotes". These sections can contain the following mailbox settings:
+#
+# auto:
+#   Indicates whether the mailbox with this name is automatically created
+#   implicitly when it is first accessed. The user can also be automatically
+#   subscribed to the mailbox after creation. The following values are
+#   defined for this setting:
+# 
+#     no        - Never created automatically.
+#     create    - Automatically created, but no automatic subscription.
+#     subscribe - Automatically created and subscribed.
+#  
+# special_use:
+#   A space-separated list of SPECIAL-USE flags (RFC 6154) to use for the
+#   mailbox. There are no validity checks, so you could specify anything
+#   you want in here, but it's not a good idea to use flags other than the
+#   standard ones specified in the RFC:
+#
+#     \All      - This (virtual) mailbox presents all messages in the
+#                 user's message store. 
+#     \Archive  - This mailbox is used to archive messages.
+#     \Drafts   - This mailbox is used to hold draft messages.
+#     \Flagged  - This (virtual) mailbox presents all messages in the
+#                 user's message store marked with the IMAP \Flagged flag.
+#     \Junk     - This mailbox is where messages deemed to be junk mail
+#                 are held.
+#     \Sent     - This mailbox is used to hold copies of messages that
+#                 have been sent.
+#     \Trash    - This mailbox is used to hold messages that have been
+#                 deleted.
+#
+# comment:
+#   Defines a default comment or note associated with the mailbox. This
+#   value is accessible through the IMAP METADATA mailbox entries
+#   "/shared/comment" and "/private/comment". Users with sufficient
+#   privileges can override the default value for entries with a custom
+#   value.
+
+# NOTE: Assumes "namespace inbox" has been defined in 10-mail.conf.
+namespace inbox {
+  # These mailboxes are widely used and could perhaps be created automatically:
+  mailbox Drafts {
+    special_use = \Drafts
+  }
+  mailbox Junk {
+    special_use = \Junk
+  }
+  mailbox Trash {
+    special_use = \Trash
+  }
+
+  # For \Sent mailboxes there are two widely used names. We'll mark both of
+  # them as \Sent. User typically deletes one of them if duplicates are created.
+  mailbox Sent {
+    special_use = \Sent
+  }
+  #mailbox "Sent Messages" {
+  #  special_use = \Sent
+  #}
+
+  # If you have a virtual "All messages" mailbox:
+  #mailbox virtual/All {
+  #  special_use = \All
+  #  comment = All my messages
+  #}
+
+  # If you have a virtual "Flagged" mailbox:
+  #mailbox virtual/Flagged {
+  #  special_use = \Flagged
+  #  comment = All my flagged messages
+  #}
+}

src/mailserver/assets/dovecot.conf.d/20-lmtp.conf

@@ -0,0 +1,29 @@
+##
+## LMTP specific settings
+##
+
+# Support proxying to other LMTP/SMTP servers by performing passdb lookups.
+#lmtp_proxy = no
+
+# When recipient address includes the detail (e.g. user+detail), try to save
+# the mail to the detail mailbox. See also recipient_delimiter and
+# lda_mailbox_autocreate settings.
+lmtp_save_to_detail_mailbox = no
+recipient_delimiter = -
+lda_mailbox_autocreate = yes
+lda_mailbox_autosubscribe = yes
+
+# Verify quota before replying to RCPT TO. This adds a small overhead.
+#lmtp_rcpt_check_quota = no
+
+# Which recipient address to use for Delivered-To: header and Received:
+# header. The default is "final", which is the same as the one given to
+# RCPT TO command. "original" uses the address given in RCPT TO's ORCPT
+# parameter, "none" uses nothing. Note that "none" is currently always used
+# when a mail has multiple recipients.
+#lmtp_hdr_delivery_address = final
+
+protocol lmtp {
+  # Space separated list of plugins to load (default is global mail_plugins).
+  #mail_plugins = $mail_plugins
+}

src/mailserver/assets/main.cf

@@ -0,0 +1,62 @@
+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+
+# Network settings
+myhostname = mail.brbytes.org
+myorigin = $myhostname
+mydestination = $myhostname, localhost.localdomain, localhost
+relayhost = 
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+inet_interfaces = all
+inet_protocols = all
+
+# Virtual Addresses
+virtual_alias_domains = mailtest.brbytes.org
+virtual_alias_maps = hash:/etc/postfix/virtual
+# address tag delimiter
+recipient_delimiter = -
+
+# anti-spam restrictions
+smtpd_recipient_restrictions = reject_invalid_hostname, reject_unknown_recipient_domain, reject_unauth_destination, reject_rbl_client sbl.spamhaus.org, permit
+smtpd_helo_restrictions = reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname
+
+# TLS settings
+# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
+# information on enabling SSL in the smtp client.
+smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+# whether to allow or enforce TLS. Acceptable values are 'none', 'may', or 'encrypt'.
+smtpd_tls_security_level=may
+# where to find certs
+smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
+smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
+
+# SASL (user authentication) settings
+smtpd_sasl_type = dovecot
+# Can be an absolute path, or relative to $queue_directory
+# Debian/Ubuntu users: Postfix is setup by default to run chrooted, so it is best to leave it as-is below
+smtpd_sasl_path = private/auth
+# and the common settings to enable SASL:
+smtpd_sasl_auth_enable = yes
+# With Postfix version before 2.10, use smtpd_recipient_restrictions
+smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
+# More settings
+smtpd_sasl_security_options=noanonymous
+smtpd_sasl_local_domain=$myhostname
+smtpd_client_restrictions=permit_sasl_authenticated,reject
+#smtpd_sender_login_maps=hash:/etc/postfix/virtual
+#smtpd_sender_restrictions=reject_sender_login_mismatch
+
+# mail delivery settings
+mailbox_transport = lmtp:unix:private/dovecot-lmtp
+#virtual_transport = lmtp:unix:private/dovecot-lmtp
+
+# Additional Settings
+mailbox_size_limit = 0
+smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
+biff = no
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+readme_directory = no
+# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
+# fresh installs.
+compatibility_level = 2

src/mailserver/assets/postfix.service.override

@@ -0,0 +1,2 @@
+[service]
+ExecStartPre="/usr/local/bin/mkvirtual"

src/mailserver/docs/Build.md

@@ -0,0 +1,212 @@
+# build postfix container
+
+## basic setup
+
+### create container
+
+build & launch debian-base container:
+```
+git clone https://git.brbytes.org/mario/container.git
+cd container
+./install.sh
+cd src/debian
+sudo pdm-build
+sudo pdm-launch debian postfix
+sudo pdm-shell postfix
+```
+
+### add user
+
+add `vmail` user with appropriate UID. Run:
+```
+addgroup --gid ${files_uid:?} vmail
+adduser vmail --ingroup vmail --uid ${files_uid:?} --disabled-password --gecos "Virtual Mail Owner" --shell /usr/sbin/nologin --home /var/mail/virtual
+```
+
+## postfix
+
+### Install
+
+install postfix:
+```
+apt install postfix
+```
+select `2 (internet site)` when asked how to configure, and enter your appropriate hostname.
+
+edit config:
+```
+cd /etc/postfix/
+nano main.cf
+```
+
+### main.cf
+
+All of the excerpts in this section should be included in `main.cf`.
+
+configure the domain:
+```
+# domain
+myhostname = mail.brbytes.org
+myorigin = $myhostname
+mydestination = $myhostname, localhost.localdomain, localhost
+```
+
+tell postfix where to look for aliases:
+```
+alias_maps = hash:/etc/postfix/aliases
+alias_database = hash:/etc/postfix/aliases
+recipient_delimiter = -
+```
+
+add some sanity checking to block spam/malicious emails:
+```
+# anti-spam restrictions
+smtpd_recipient_restrictions = reject_invalid_hostname, reject_unknown_recipient_domain, reject_unauth_destination, reject_rbl_client sbl.spamhaus.org, permit
+smtpd_helo_restrictions = reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname
+```
+
+remove the line setting the `smtpd_use_tls` parameter, and replace it with:
+```
+# whether to allow or enforce TLS. Acceptable values are 'none', 'may', or 'encrypt'.
+smtpd_tls_security_level=may
+```
+we also want to tell postfix where it can find our SSL certificates:
+```
+smtpd_tls_cert_file=${path_to_cert:?}
+smtpd_tls_key_file=${path_to_key:?}
+```
+configure postfix to use Dovecot SASL for user authentication:
+```
+#configure Dovecot SASL
+smtpd_sasl_type = dovecot
+# Can be an absolute path, or relative to $queue_directory
+# Debian/Ubuntu users: Postfix is setup by default to run chrooted, so it is best to leave it as-is below
+smtpd_sasl_path = private/auth
+# and the common settings to enable SASL:
+smtpd_sasl_auth_enable = yes
+# With Postfix version before 2.10, use smtpd_recipient_restrictions
+smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
+# More settings
+smtpd_sasl_security_options=noanonymous
+smtpd_sasl_local_domain=$myhostname
+smtpd_client_restrictions=permit_sasl_authenticated,reject
+smtpd_sender_login_maps=hash:/etc/postfix/virtual
+smtpd_sender_restrictions=reject_sender_login_mismatch
+```
+Configure postfix to use Dovecot LMTP for mail delivery:
+```
+mailbox_transport = lmtp:unix:private/dovecot-lmtp
+virtual_transport = lmtp:unix:private/dovecot-lmtp
+```
+
+### virtual
+
+create virtual aliases file:
+```
+postmaster:     root
+root:           fernando, juana, mario
+```
+
+then run the following commands to update the aliases list:
+```
+newaliases
+postfix reload
+```
+
+## Dovecot
+
+We also need to configure dovecot. Go to its configuration directory:
+```
+cd /etc/dovecot
+```
+
+Edit the file `dovecot.conf` and add the line:
+```
+protocols = imap lmtp
+```
+we need to create a `users` file containing our usernames and passwords. Don't forget to set its permissions properly:
+```
+chmod u=rw,g=r,o= users
+chown root:dovecot users
+```
+create dir for virtual mailboxes:
+```
+mkdir -p /var/mail/virtual
+chown -R vmail:vmail /var/mail/virtual
+```
+
+### conf.d
+
+There are several config files in `conf.d` that we will also need to edit:
+
+First, we need to enable SASL so that Dovecot can tell postfix whether or not a user is authenticated. Edit the file `10-master.conf`, and add/uncomment the following directive to the `service auth` section:
+```
+  # Postfix smtp-auth
+  unix_listener /var/spool/postfix/private/auth {
+    mode = 0666
+    # Assuming the default Postfix user and group
+    user = postfix
+    group = postfix
+  }
+```
+
+Next, edit the file `10-auth.conf`, and edit the `auth_mechanisms` directive to be:
+```
+# Outlook Express and Windows Mail works only with LOGIN mechanism, not the standard PLAIN:
+auth_mechanisms = plain login
+```
+
+We also want to enable LMTP. Edit `10-master.conf` again and add/uncomment the directive:
+```
+service lmtp {
+  user = vmail
+  unix_listener /var/spool/postfix/private/dovecot-lmtp {
+   group = postfix
+   mode = 0600
+   user = postfix
+  }
+}
+```
+We also need to configure some settings for LMTP. Edit `20-lmtp.conf` and add the directives:
+```
+lmtp_save_to_detail_mailbox = no
+recipient_delimiter = -
+lda_mailbox_autocreate = yes
+lda_mailbox_autosubscribe = yes
+```
+
+We also need to tell Dovecot what database to look up users in. Edit `10-auth.conf` and delete/comment any lines including a `.ext` file (includes begin with an exclamation point). Then, add the directives:
+```
+passdb {
+  driver = passwd-file
+  # username_format: Set to '%u' to look up full usernames. If you want to enable
+  # user@domain logins but have only user in the file, set to %n instead.
+  args = username_format=%n /etc/dovecot/users
+}
+
+userdb {
+  driver = static
+  args = uid=vmail gid=vmail home=/var/mail/virtual/%n
+}
+```
+We also want to configure where mail is stored and in what format. Edit `10-mail.conf` and delete/comment the line setting `mail_location`. Replace it with:
+```
+mail_location = maildir:~/Maildir:LAYOUT=fs
+```
+We need to tell Dovecot to listen on the IMAP ports so we can access it with IMAP clients. Add/uncomment the following directives in `10-master.conf`:
+```
+service imap-login {
+  inet_listener imap {
+    port = 143
+  }
+  inet_listener imaps {
+    port = 993
+    ssl = yes
+  }
+}
+```
+Tell dovecot where to get its SSL certificates by setting the following directives in `10-ssl.conf`:
+```
+ssl_cert = <${path_to cert:?}
+ssl_key = <${path_to_key:?}
+```

src/mailserver/docs/Deploy.md

@@ -0,0 +1,33 @@
+# steps needed to deploy mailserver
+
+## create dirs
+
+```
+mkdir -p /srv/volumes/mailserver/{db,mail}
+chown -R 5000:5000 /srv/volumes/mailserver
+```
+put your `users` and `aliases.d` in the `db` directory. Mail will go in the `mail` directory.
+
+## make sure mail ports are open
+
+add the following directives to the `myfirewall` chain in `/etc/nftables`:
+```
+                # accept incoming SMTP(s) connections
+                tcp dport {25, 465} accept
+
+                # accept incoming IMAP(s) connections
+                tcp dport {143, 993} accept
+```
+then make sure configuration has taken place by running:
+```
+nft -f /etc/nftables
+```
+
+## set up domain name
+
+Need MX and CNAME records.
+
+## get SSL certificates from letsencrypt
+
+use certbot
+

src/postfix/Containerfile

@@ -1,29 +0,0 @@
-###
-### Meta Information
-###
-FROM localhost/debian
-
-# deploy options
-# -p (port) and -v (volume) both go host:container
-LABEL deployopts="\
--p 25:25 \
--p 465:465 \
--p 143:143 \
--p 993:993"
-
-# Build Variables
-# uid that the files owner user should have
-ARG FILESUID=5000
-
-###
-### General Setup
-###
-
-# tell debian not to ask any questions during package install
-ARG DEBIAN_FRONTEND=noninteractive
-
-# set the mailname
-RUN echo "mail.brbytes.org" > /etc/mailname
-
-# install packages we want
-RUN apt update -y && apt install -y postfix dovecot-imapd dovecot-lmtpd

src/postfix/docs/Build.md

@@ -1,40 +0,0 @@
-# build postfix container
-
-## create container
-
-build & launch debian-base container:
-```
-git clone https://git.brbytes.org/mario/container.git
-cd container
-./install.sh
-cd src/debian
-sudo pdm-build
-sudo pdm-launch debian postfix
-sudo pdm-shell postfix
-```
-
-## postfix
-
-install postfix:
-```
-apt install postfix
-```
-select `1 (no configuration)` when asked how to configure.
-
-copy default config for postfix:
-```
-cp /usr/share/postfix/main.cf.dist /etc/postfix/main.cf
-```
-edit config:
-```
-cd /etc/postfix/
-nano main.cf
-```
-
-set the following config parameters:
-```
-mail_owner = postfix
-myhostname = mail.brbytes.org
-myorigin = $myhostname
-mydestination = $myhostname
-```