I'm afraid that even after the dovecot fix there are still errors.
My users can now get their e-mail from webmail but not from Outlook (I believe that IMAP works but POP3 doesn't)
This what appears on the maillog
Feb 24 21:03:52 ns1 dovecot: pop3-login: Login: user=, method=PLAIN, rip=::ffff:85.75.xx.xx, lip=::ffff:194.219.xx.xx
Feb 24 21:03:52 ns1 dovecot: POP3(username): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0
On messages I get:
Feb 24 21:03:45 ns1 dovecot(pam_unix): authentication failure; logname= uid=0 euid=0 tty=dovecot ruser= rhost=::ffff:85.75.xx.xx user=username