I have upgraded one server from 10.3 to latest PLESK and I get problems with some mail accounts. Some clients started to complain that cannot login anymore to webmail (ATMAIL) I have tested some of my accounts and working, and tested other accounts and not working indeed. Also I have the same test by telnet 143 and same result, login failed for some users and working for others. I like this vodooo things, I have tried to fix mailboxes, but nothing. Anyone have an idea where to check? in maillog no clue on thislogin errors.