pop3/imap authentication stop working after upgrading a VPS from 8.0.1 to 8.3

[by88]

I have upgraded plesk from 8.0.1 to 8.3 on a centos4.4 vps and pop3/imap authentication stop working.

All users receive emails but noone can login:

tail -f /usr/local/psa/var/log/maillog

...
Mar 20 00:35:08 srv01 imapd: Connection, ip=[127.0.0.1]
Mar 20 00:35:15 srv01 imapd: IMAP connect from @ [127.0.0.1]checkmailpasswd: FAILED: [email protected] - no such user from @ [127.0.0.1]ERR: LOGIN FAILED, ip=[127.0.0.1]
Mar 20 00:35:29 srv01 last message repeated 2 times
Mar 20 00:35:29 srv01 imapd: 1205969729.308974 LOGOUT, ip=[127.0.0.1], rcvd=17, sent=98, maildir=/


trying telnet:

telnet mail.mydomain.tld 110
Trying www.zzz.yyy.xxx...
Connected to mail.mydomain.tld.
Escape character is '^]'.
+OK Hello there. <[email protected]>
user [email protected]
+OK Password required.
pass xxxxxxxx
-ERR Login failed.
Connection closed by foreign host.


I have already run:
find /var/qmail/mailnames -type d -name '.*' -a -not -name '.spamassassin' -exec touch '{}'/maildirfolder \; -exec chown popuseropuser '{}'/maildirfolder \;
/usr/local/psa/admin/bin/mchk --without-spam


I have already checked almost everything I have found online but nothing works.

Suggestions?

 

[Monica@]

Hi.
Check /etc/hosts file. the alias "localhost" and "localhost.localdomain" should be present there.

 

[Monica@]

check also the articles
http://kb.swsoft.com/en/1143
http://kb.swsoft.com/en/956