Ubuntu 11.10 server with postfix/dovecot/squirrelmail configured.

Outgoing SMTP server seemed worked fine, however, the incoming IMAP with SSL on port 993 doesn't seem to receive any mail at all !?  Here is the mail.log during the test session from an external yahoo mail (dchenusa@yahoo.com) to the internal server testmail.biokeyinc.com (dchen@testmail.biokeyinc.com) The log did NOT show any error !  The sender showed sent mail! but no mail reach to the destination! Any help would be appreciated.

Apr 19 01:20:02 testmail postfix/smtpd[4103]: connect from nm20-vm4.bullet.mail.ne1.yahoo.com[98.138.91.180] Apr 19 01:20:03 testmail postfix/smtpd[4103]: 091ED200973: client=nm20-vm4.bullet.mail.ne1.yahoo.com[98.138.91.180] Apr 19 01:20:03 testmail postfix/cleanup[4108]: 091ED200973: message-id=32C9C558-95DA-417D-8687-41ABE1296D61@yahoo.com Apr 19 01:20:03 testmail postfix/qmgr[2007]: 091ED200973: from=dchenusa@yahoo.com, size=2840, nrcpt=1 (queue active) Apr 19 01:20:03 testmail postfix/smtpd[4103]: disconnect from nm20-vm4.bullet.mail.ne1.yahoo.com[98.138.91.180] Apr 19 01:20:12 testmail postfix/smtpd[4113]: connect from localhost[127.0.0.1] Apr 19 01:20:12 testmail postfix/smtpd[4113]: 33AE9200AE9: client=localhost[127.0.0.1] Apr 19 01:20:12 testmail postfix/cleanup[4108]: 33AE9200AE9: message-id=32C9C558-95DA-417D-8687-41ABE1296D61@yahoo.com Apr 19 01:20:12 testmail postfix/qmgr[2007]: 33AE9200AE9: from=dchenusa@yahoo.com, size=3536, nrcpt=1 (queue active) Apr 19 01:20:12 testmail postfix/smtpd[4113]: disconnect from localhost[127.0.0.1] Apr 19 01:20:12 testmail amavis[2042]: (02042-06) Passed CLEAN, [98.138.91.180] [98.138.87.4] dchenusa@yahoo.com -> dchen@testmail.biokeyinc.com, Message-ID: 32C9C558-95DA-417D-8687-41ABE1296D61@yahoo.com, mail_id: rqyVZiQDwSsG, Hits: -0.109, size: 2837, queued_as: 33AE9200AE9, dkim_id=dchenusa@yahoo.com,@yahoo.com, 8647 ms Apr 19 01:20:12 testmail postfix/smtp[4109]: 091ED200973: to=dchen@testmail.biokeyinc.com, relay=127.0.0.1[127.0.0.1]:10024, delay=9.5, delays=0.87/0.01/0/8.6, dsn=2.0.0, status=sent (250 2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 33AE9200AE9) Apr 19 01:20:12 testmail postfix/qmgr[2007]: 091ED200973: removed Apr 19 01:20:12 testmail postfix/local[4114]: 33AE9200AE9: to=dchen@testmail.biokeyinc.com, relay=local, delay=0.18, delays=0.1/0/0/0.07, dsn=2.0.0, status=sent (delivered to command: procmail -a "$EXTENSION") Apr 19 01:20:12 testmail postfix/qmgr[2007]: 33AE9200AE9: removed Apr 19 01:21:30 testmail dovecot: imap-login: Login: user=<dchen>, method=PLAIN, rip=63.195.90.22, lip=192.168.20.100, mpid=4122, TLS Apr 19 01:23:13 testmail dovecot: imap(dchen): Disconnected: Disconnected in IDLE bytes=99/708 Apr 19 01:23:23 testmail postfix/anvil[4105]: statistics: max connection rate 1/60s for (smtp:98.138.91.180) at Apr 19 01:20:02 Apr 19 01:23:23 testmail postfix/anvil[4105]: statistics: max connection count 1 for (smtp:98.138.91.180) at Apr 19 01:20:02 Apr 19 01:23:23 testmail postfix/anvil[4105]: statistics: max cache size 1 at Apr 19 01:20:02