[ubuntu] problem with incoming mail server

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http://ubuntuforums.org – hello, after i setup ubuntu server 11.10 my send mail is okay but i can not receive emails this is from my /var/log/mail.log Code: Jan 12 09:38:30 malek dovecot: pop3-login: Disconnected (tried to use disabled plaintext auth): rip=, lip= Jan 12 09:38:33 malek postfix/smtpd[6481]: connect from unknown[] Jan 12 09:38:33 malek postfix/smtpd[6481]: 0506A3C191A: client=unknown[] Jan 12 09:38:33 malek postfix/cleanup[6485]: 0506A3C191A: message-id=<> Jan 12 09:38:33 malek postfix/qmgr[6256]: 0506A3C191A: from=<[email protected]& (Hardware)