On July 19, 2018 at 9:41 AM David Favor <david@davidfavor.com> wrote:

Working out upgrade of old 1.x + 2.x Dovecot installs to latest 2.3.2.1 out of Ubuntu Bionic repositories.

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https://wiki.dovecot.org/Services suggests Dovecot can be used for full mail infrastructure, avoiding the complexity of exim4 or other MTA setup/management.

Let me know if I understand this correctly.

1. https://wiki.dovecot.org/Submission can be used to listen on port 25 + port 587 (with auth).

This is a proxy only. For any non-local delivery, you still need a submission server to deliver (and queue) mail remotely. That requires a full SMTP service running somewhere.

2. https://wiki.dovecot.org/Pigeonhole can be used for filtering, including forwarding email to other machines.

3. https://wiki.dovecot.org/Pigeonhole/ManageSieve/Configuration can be used to forward off machine email, for example flowing through a relay service like MailGun, using a simple script or service like ESMTPD.

4. https://wiki.dovecot.org/LMTP can be used to deposit messages into filesystem as Maildir or dbox or mdbox backing stores.

michael