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External filter question [message #210] Fri, 21 April 2006 13:59
Axel Richter
Messages: 1
Registered: April 2006
Junior Member
Hi,

we want (to avoid false positives) write an external filter, which works on specific words in the Mail. If one of the words can be found, the message should be delivered and (thats the problem) NOT beeing tested by subsequent filters.

For example: If the mail contains the word "myham" it should be delivered. The filter command line is

grep -e "\(myham\|...\)" %IN%

So, this works ok, but what policy to set, that subsequent filters are not tested and/or testing has no effect on that message?

Thanks, Axel.

Re: External filter question [message #211 is a reply to message #210] Fri, 21 April 2006 18:34 Go to previous message
Heidner
Messages: 121
Registered: February 2005
Senior Member
You could always write a rule for SPAM ASSASSIN that checks just for the specific words... then add a scoring rule that adds -200 points. That would pretty much ensure that the e-mail would make it past spam assassin.

The mime and attachment filters do not check for words -- so they shouldn't stop the e-mail from coming through. The virus filters could block the e-mail if a virus/worm is found -- even if the specific word is in it. But in my view -- I'd prefer the e-mail to be deleted than take a chance that someone happened to find a backdoor method to get a trojan into the mail server.
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