Spammers are sneaky and most are smart enough to figure out how to worm their way past
even the most sophisticated filters eventually. As a result, trying to fight spam by construct-
ing your own set of rules is a losing battle. Here are just a few of the obstacles you face:
■If you try to identify words or phrases commonly used in spam, you’ll be foiled by the
creative misspellings and unique turns of phrase that junk senders use.
■Want to block individual senders? It’s a losing battle, because most spammers use
forged headers and return addresses. Even with a list ...
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