Here is how I set up dovecot.

<code>
$ doas pkg_add dovecot
</code>

In /etc/dovecot/dovecot.conf, add these lines at the very bottom:

<code>
service lmtp {
  user = vmail
}

#auth_verbose=yes
#auth_debug=yes
#auth_debug_passwords=yes
#mail_debug=yes
#auth_verbose_passwords=sha1
verbose_ssl=yes
</code>

You can turn on debugging, verbose ssl, and so forth as you need to help troubleshoot.

In /etc/dovecot/conf.d/10-auth.conf, I make these changes:

<code>
#!include auth-system.conf.ext
passdb {
   args = scheme=blf-crypt /etc/mail/passwd
   driver = passwd-file
}

userdb {
   args = uid=vmail gid=vmail home=/var/vmail/%d/%n
   driver = static
}
</code>

Comment out auth-system.conf.ext and add the new passdb/userdb conf settings.

In /etc/dovecot/conf.d/10-mail.conf:

<code>
mail_location = maildir:/var/vmail/%d/%n/Maildir
</code>

In /etc/dovecot/conf.d/10-ssl.conf, I make these changes:

<code>                                                                                    
ssl = required                                                                        
...
ssl_cert = </etc/ssl/ircnow.org.fullchain.pem
ssl_key = </etc/ssl/private/ircnow.org.key
ssl_dh_parameters_length = 2048
</code>