Could you please be kind answer few mail related questions?
How does it work to have few users for a domain? Where the other users' mail will be stored? How do you access it if the user under Linux is different? Is this possible to change homes directory to something else?
Is there a scheduled script that could go through a specific folder in Maildir to learn spam messages that were manually moved to Spam folder?
How to switch from using saslauthd/PLAIN to using md5_crypt with Postfix/Dovecot?