Interesting, did your server have user "vmail" created (with uid 1006) before installing iRedMail?
Now, I don't get erros in log, but all mail clients (phone gmail, thunderbird, etc) complains because there's no Sent, trash, spam, etc folders in the new account. That happen with all new accounts. Logs says "folder created", but it seems to be created after the client fail, not before.
EDIT: also getting
Feb 10 10:07:14 mail dovecot: auth-worker(20321): Warning: mysql: Query failed, retrying: Lost connection to MySQL server during query (idled for 0 secs)
Feb 10 10:07:14 mail dovecot: auth-worker(20321): Error: mysql(127.0.0.1): Connect failed to database (vmail): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 1 seconds before retry
Feb 10 10:07:14 mail dovecot: dict(20333): Error: mysql(127.0.0.1): Connect failed to database (vmail): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 1 seconds before retry
Feb 10 10:07:14 mail dovecot: dict(20333): Error: mysql(127.0.0.1): Connect failed to database (vmail): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 1 seconds before retry
Feb 10 10:07:15 mail dovecot: auth-worker(20321): Error: mysql(127.0.0.1): Connect failed to database (vmail): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 5 seconds before retry
Feb 10 10:07:15 mail dovecot: dict(20333): Error: mysql(127.0.0.1): Connect failed to database (vmail): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 5 seconds before retry
Feb 10 10:07:15 mail dovecot: dict(20333): Error: mysql(127.0.0.1): Connect failed to database (vmail): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 5 seconds before retry
Feb 10 10:07:21 mail dovecot: dict(20333): Error: sql dict: commit failed: Deadlock found when trying to get lock; try restarting transaction
Feb 10 10:10:07 mail dovecot: master: Dovecot v2.2.33.2 (d6601f4ec) starting up for pop3, imap, sieve, lmtp (core dumps disabled)
also
Feb 10 12:18:06 mail postfix/qmgr[6036]: 48GV0G2tD6z3B6mT: from=<amavis@example.ar>, size=682, nrcpt=1 (queue active)
Feb 10 12:18:06 mail amavis[4731]: (04731-04) (!)connect to /var/run/clamav/clamd.ctl failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.ctl: No such file or directory
Feb 10 12:18:07 mail amavis[4731]: (04731-04) (!)connect to /var/run/clamav/clamd.ctl failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.ctl: No such file or directory
Feb 10 12:18:07 mail amavis[4731]: (04731-04) (!)clamav-socket: All attempts (1) failed connecting to /var/run/clamav/clamd.ctl, retrying (2)
Feb 10 12:18:13 mail amavis[4731]: (04731-04) (!)connect to /var/run/clamav/clamd.ctl failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.ctl: No such file or directory
Feb 10 12:18:13 mail amavis[4731]: (04731-04) (!)clamav-socket av-scanner FAILED: run_av error: Too many retries to talk to /var/run/clamav/clamd.ctl (All attempts (1) failed connecting to /var/run/clamav/clamd.ctl) at (eval 113) line 659.\n
Feb 10 12:18:13 mail amavis[4731]: (04731-04) (!)WARN: all primary virus scanners failed, considering backups
