[ubuntu] postfix/dovecot server Can't receive mails!

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http://ubuntuforums.org – In order to replace the old Linux box (currently running Fedora with postfix/dovecot mail server), I built an Ubuntu server 12.04 on a new hardware with same postfix/dovecot/squirrelmail services. To keep my old Linux (Fedora) server intact, and for the purpose of testing the new Ubuntu mail server, I configured this new Ubuntu server on the subdomain, testmail.biokeyinc.com. On this new testmail.biokeyinc.com machine, I was able to receive and send from/to external mails such as yahoo and gmail, so far so good, but only bother is that there is a constant line below (every 2 minutes) dis (Hardware)