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Dovecot with LMTP and Sieve

Features

  • Exposes two ports for IMAP clients: 143, as usual, and 1433 for IMAP behind haproxy PROXY protocol

  • Receives mail from postfix via LMTP (port 26)

  • Sorts received mail with Sieve

  • Also sorts "sent" mail!

  • considers both + and - as "recipient delimiters", so you can use both "[email protected]" and "[email protected]" for registering on websites - they both will be delivered to "[email protected]", and you can easily track who leaked your email.

  • List of users with passwords stored in single file

Installation

  • Add users to data/conf/passwd.txt file, in format like this:

      {email}:{encrypted-password}

    To encrypt the password you can use openssl passwd command. For example, to add user with email "[email protected]" and password "Tr0ub@dur", you can execute this line:

      $ echo "[email protected]:`openssl passwd Tr0ub@dur`" | tee -a data/conf/passwd.txt
  Warning: truncating password to 8 characters
  [email protected]:k3Nn97/2DWock

  • Create maildirs for them, like this:

      mkdir -p data/[email protected]/Maildir

  • Add users' sieve scripts next to the above Maildir directory, naming them in.sieve for filtering incoming email and out.sieve for filtering outgoing email.

    For example, for user "[email protected]" create data/mail/[email protected]/in.sieve file.

    For users who like messages from strangers (people not in their address book) to be sorted directly to trash, add this at the end of their sieve file:

      elsif address :is "from" [
  ### contacts begin ###
  ### contacts end ###
  "x"]{ keep; }
  else { fileinto "Trash"; }

    and run the daily.sh script in parent dir.

    Note that elsif assumes there are other conditions above. Also note that you might have other elsif blocks before final else - in case you want to do something extra sorting for messages-from-non-friends, for example based on "+" tags.

  • To auto-delete (expunge) old messages (say, from Trash and spam), create expunge.txt files next to each of the user's Maildir directories, with format like this:

      Spam 7d
  Trash 30d

    to auto-delete messages from Spam folder 7 days, and from Trash - 30 days after they were received.

    Deletion itself is done by data/expunge.sh script which should be run inside container every day. You can add daily.sh from parent dir to your host crontab.

Usage

To deliver email to this dovecot from your postfix, add this to your main.cf file:

# disable local delivery
mydestination=

# deliver to dovecot container
virtual_mailbox_domains = $mydomain
virtual_transport = lmtp:inet:dovecot:26
lmtp_host_lookup = native

where dkim is IP address or hostname of VM or container where this milter is running, and lmtp_host_lookup = native might be needed if IP address is stored in /etc/hosts file.

To read email from mail client, just use it as a normal IMAP server.

If IMAP server is behind proxy, use HAproxy PROXY protocol and port 1433

Used sources