steps needed to deploy mailserver

create dirs

sudo mkdir -p /srv/vol/mailsrv/{db,mail,ssl}
sudo chown -R 5000:5000 /srv/vol/mailsrv
sudo chmod go-rwx /srv/vol/mailsrv/ssl

put your users and aliases.d in the db directory. Mail will go in the mail directory.

sudo -i
cd /srv/vol/mailsrv/db
mkdir aliases.d

create aliases as needed

vi /srv/vol/mailsrv/db/users

format is like a passwd file with user:passwd (no spaces between)

make sure that all files are owned by 5000:5000

make sure mail ports are open

add the following directives to the myfirewall chain in /etc/nftables.conf:

                # accept incoming SMTP(s) connections
                tcp dport {25, 587} accept

                # accept incoming IMAP(s) connections
                tcp dport {143, 993} accept

then make sure configuration has taken place by running:

nft -f /etc/nftables.conf

set up domain name

Set up a DNS A Record pointing to your host machine. Make sure it works by running:

ping ${dnsname:?}

get SSL certificates from letsencrypt

install acme.sh

apt install socat
git clone https://github.com/acmesh-official/acme.sh.git
cd acme.sh
./acme.sh --install --home /usr/local/lib/acme-sh \
          --config-home /etc/acme-sh \
          --accountemail letsencrypt@mail.alemor.org

Then exit and relogin to refresh the bash hash

acme.sh --issue --alpn --pre-hook 'systemctl stop haproxy' \
        --post-hook 'systemctl start haproxy' -d mail.alemor.org
acme.sh --install-cert -d mail.alemor.org \
        --fullchain-file /srv/vol/mailsrv/ssl/fullchain.pem \
        --key-file /srv/vol/mailsrv/ssl/privkey.pem

make users and aliases

cd /srv/volumes/mailsrv/db
mkdir aliases.d
touch users
chmod go= users

then edit users and add aliases lists to aliases.d. Don't forget to change its ownership once you're done:

chown -R 5000:5000 /srv/volumes/mailsrv/db

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