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gtalug / infrastructure

GTALUG infrastructure (the server).
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Train SpamAssassin to better understand Spam #42

Open myles opened 9 years ago

myles commented 9 years ago

We are getting a lot of spam message end up in mailman queue system. We need to better train SpamAssassin.

alvinstarr commented 9 years ago

are you using greylisting? It made a huge difference in the amount of spam we had to process.

myles commented 9 years ago

We aren't using greylisting how would this help in a mailing list?

alvinstarr commented 9 years ago

greylisting causes a back off when someone new wants to send a message. So on the first attempt of a new message from someone new the grey lister will tell the sending mail server that there is a problem and come back in 5 minutes. At that point a real mail server will queue up the message again and try later but spammers will just forget it and go on to the next victim.

We found that it cut down on the amount of spam we ad to process by something like 90%.

It does have the side effect that first messages are not delivered immediately but could be delayed for a while.