==== Required information ====
- iRedMail version: 0.9.1
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Apache
- Linux/BSD distribution name and version: Ubuntu
- Related log if you're reporting an issue:
====

I have two domains - primary.pl and secondary.pl with user1@primary.pl and user2@secondary.pl
Both domains have relevant dns records, I can send and recive mail from SOGo (web interface) with no issues.

iRedMail runs on mail.primary.pl and dns for mail.secondary.pl point to the same IP address.
SOGo works from both mail.primary.pl/SOGo and mail.secondary.pl/SOGo

I can connect to user1@primary.pl with thunderbird with no issues as well, but I keep getting a "username or pasword is incorrect" error in thunderbird for user2@secondary.pl

I tried every possible combination in thunderbird setup - user2@secondary.pl with mail.primary.pl, mail.secondary.pl, user2 with mail.primary.pl, mail.secondary.pl and so on...

Update:
Everything works fine in 0.9.0