In this part of the FreeBSD mail server, we build on the recent two posts where we set up the IMAP and SMTP and extend our configuration to support virtual users, which means that we don’t autenticate with system users anymore and, alongside, hand over the incoming email management to Dovecot by providing email from OpenSMTPd to Dovecot using LMTP. Since both daemons will not work together more closely, we will also unify the login credentials in a single passwd-style file that can be read from both OpenSMTPd and Dovecot.
This is a follow-up post to the initial FreeBSD mail server article that I posted a few weeks ago. In this step, we will build upon what we set up in the first part and add the possibility to fetch email from a mail client using IMAP. We will still use system users for authentication, before we switch to virtual users in the next step.
In this series we will set up a fully-featured mail server in a FreeBSD jail using OpenSMTPd, Dovecot and rspamd.