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There is another option called greylisting. Without getting into the details, you basically tell SpamAssassin to lie to the
incoming mail server and give it a try again later message. This will put a slight delay in emails coming in. A valid mail
server will try again a little bit later and the mail should get through at that point. Depending on the sophistication of
the spammer, this stands a chance of helping to reduce some of the spam that tries to get through. Greylisting can be done
with either SpamAssassin or the MTA that you are using. www.greylisting.org is one place where you can get information on
implementing greylisting. The SpamAssassin listserv will help you get information on doing it with SA as well.
If you are using postfix as your MTA with SpamAssassin, subscribe to the listserv for postfix and watch for real time blacklist
sites. Althought this will take your MTA a little longer to work with, you get the the bonus of being able to block spam as
soon as it gets listed on one of these sites without having to continually tweak your rulesets to accomplish the same thing.
Since some of the sites come and go, a quick question on the listserv will get you several replies of what ones are the current
best ones to use. What I have described here are a few additional ways to make it a little harder for spam to get through.
Watching the listservs are a good way to keep an eye out on what the best ways to get SA to do its best for you.
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