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Spam getting through

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cmrbds View Drop Down

Joined: 14 February 2005
Location: United States
Status: Offline
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cmrbds Quote  Post ReplyReply Direct Link To This Post Topic: Spam getting through
    Posted: 29 March 2005 at 12:10pm

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 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 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:
03/28/05 18:36:26:576 -- (2596) - MAPS search done...
03/28/05 18:36:26:576 -- (2596) RCPT TO: accepted
03/28/05 18:36:27:998 -- (2596) Mail from:
03/28/05 18:36:27:998 -- (2596) RCPT TO: accepted
03/28/05 18:36:29:091 -- (2596) Mail from:
03/28/05 18:36:29:091 -- (2596) RCPT TO: accepted
03/28/05 18:36:30:857 -- (2596) EMail from to,, passes Bayesian filter - 0% spam  (16ms)
03/28/05 18:36:30:873 -- (2596) EMail from to,, was queued. Size: 2 KB, 2048 bytes
03/28/05 18:36:30:873 -- (2040) Sending email from to,,
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 to,,  was forwarded to
03/28/05 18:36:31:529 -- (2596) Disconnect

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LogSat View Drop Down
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Admin Group

Joined: 25 January 2005
Location: United States
Status: Offline
Points: 4077
Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2005 at 6:14pm
Occasionally spam email will slip by SpamFilter, that is normal as no filter is 100% effective. How much depends on your SpamFilter settings. There are several filters that SpamFilter uses, and many of them can be tweaked by users. The one thing to check is your DNS server(s), as in this log snippet we see a TimeOut during the SPF filter test - this could possibly be caused by your DNS server timing out. Without a good DNS server, SpamFilter will not be able to perform many of its tests.
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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