#!/bin/bash

cd /vol/mail

for user in *; do
    # create an archive mailbox (and throw away error because
    # we don't mind if it already exists)
    doveadm mailbox create -u $user -s Archive 2> /dev/null

    # get current year
    currentyear=$(date +%Y)
    # assume no messages in INBOX are older than this year
    #year=2000
    year=$(($currentyear-1))
    while [[ $year -le $currentyear ]]; do
        # create an Archive/$year mailbox
        doveadm mailbox create -u $user -s Archive.$year 2> /dev/null

        # Get list of all subdirs of INBOX
        mailboxes=$(doveadm mailbox list -u $user | grep -E '^INBOX\..*$' \
                    | perl -pe 'chomp if eof' | perl -pe 's/^/MAILBOX /' \
                    | perl -pe 's/\n/ OR /')
        # add Sent and INBOX to our mailboxes list
        mailboxes="MAILBOX Sent OR MAILBOX INBOX ${mailboxes:+OR} $mailboxes"
        # move to the Archive/$year mailbox messages that:
        # have been flagged as read,
        # were received on or before $year,
        # are older than 90 days,
        # and are in our aforementioned mailboxes
        doveadm move -u $user Archive.$year SEEN BEFORE 1-Jan-$(($year+1)) \
                                            BEFORE 90d \( $mailboxes \)

        # delete messages from Trash that have been there for more than 2 weeks
        doveadm expunge -u $user SAVEDBEFORE 2w MAILBOX Trash

        # step year variable
        year=$(($year+1))
    done
done