We have recently began experiencing problems where mail that should be caught in the Spamfilter quarantine (because it's SPAM) isn't being caught for some reason and it's being passed on to the users. Several users are complaining about this issue. I was forwarded a message that got through and checked the log files to find yes indeed it did get through without any hold up (Below is the detail from the log). Can you explain to me why this got through and/or if there is anything I can do to prevent this from happening in the future.

We've recently upgraded to version 2.1.2.402 and since the upgrade it seems like more users are complaining about this problem. Could the upgrade/version have anything to do with it?

Log Example

03/28/05 18:36:26:060 -- (2596) - SPF analysis for lycos.com done: - none
03/28/05 18:36:26:060 -- (2596) - Warning: Error during SPF record check - TimedOut
03/28/05 18:36:26:060 -- (2596) Mail from: mailto:xlzjtqytemtq@lycos.com - xlzjtqytemtq@lycos.com
03/28/05 18:36:26:576 -- (2596) - MAPS search done...
03/28/05 18:36:26:576 -- (2596) RCPT TO: mailto:cjohn@pepsilane.com - cjohn@pepsilane.com accepted
03/28/05 18:36:27:998 -- (2596) Mail from: mailto:xlzjtqytemtq@lycos.com - xlzjtqytemtq@lycos.com
03/28/05 18:36:27:998 -- (2596) RCPT TO: mailto:koleary@pepsilane.com - koleary@pepsilane.com accepted
03/28/05 18:36:29:091 -- (2596) Mail from: mailto:xlzjtqytemtq@lycos.com - xlzjtqytemtq@lycos.com
03/28/05 18:36:29:091 -- (2596) RCPT TO: mailto:yweeres@pepsilane.com - yweeres@pepsilane.com accepted
03/28/05 18:36:30:857 -- (2596) EMail from mailto:xlzjtqytemtq@lycos.com - xlzjtqytemtq@lycos.com to mailto:cjohn@pepsilane.com - cjohn@pepsilane.com , mailto:koleary@pepsilane.com - koleary@pepsilane.com , mailto:yweeres@pepsilane.com - yweeres@pepsilane.com passes Bayesian filter - 0% spam  (16ms)
03/28/05 18:36:30:873 -- (2596) EMail from mailto:xlzjtqytemtq@lycos.com - xlzjtqytemtq@lycos.com to mailto:cjohn@pepsilane.com - cjohn@pepsilane.com , mailto:koleary@pepsilane.com - koleary@pepsilane.com , mailto:yweeres@pepsilane.com - yweeres@pepsilane.com was queued. Size: 2 KB, 2048 bytes
03/28/05 18:36:30:873 -- (2040) Sending email from mailto:xlzjtqytemtq@lycos.com - xlzjtqytemtq@lycos.com to mailto:cjohn@pepsilane.com - cjohn@pepsilane.com , mailto:koleary@pepsilane.com - koleary@pepsilane.com , mailto:yweeres@pepsilane.com - yweeres@pepsilane.com
03/28/05 18:36:30:919 -- (484) Time to add Msg to Bayes corpus:0
03/28/05 18:36:31:013 -- (2040) EMail from mailto:xlzjtqytemtq@lycos.com - xlzjtqytemtq@lycos.com to mailto:cjohn@pepsilane.com - cjohn@pepsilane.com , mailto:koleary@pepsilane.com - koleary@pepsilane.com , mailto:yweeres@pepsilane.com - yweeres@pepsilane.com   was forwarded to 192.168.1.2:25
03/28/05 18:36:31:529 -- (2596) Disconnect