This is a fresh installation in AWS using AMI for Plesk 12.
When installed with Dovecot I got this error when trying to login to mail:
Jun 28 12:23:44 server1 dovecot: imap-login: Disconnected (auth failed, 1 attempts in 2 secs): user=<
[email protected]>, method=DIGEST-MD5, rip=127.0.0.1...