![]() This checks for spoofed E-mail addresses. This lookup tests each address by comparing the sending domain's DNS entry against the IP address that actually sent the message. The tests performed on the messages include like a dictionary based scan that looks for words and phrases commonly used by spammers, and a client name DNS lookup. ![]() Next, SurfControl makes use of an anti SPAM agent to scrutinize each incoming mail. Closing the relay host is a good feature, but it can be easily achieved directly through Exchange. This proves to be huddle to the spammers in relaying SPAM through the server on its way to other destinations. ![]() ![]() First, SurfControl blocks the mail relay host. SurfControl takes a multi step approach to filtering SPAM. Each of these products does a reasonably good job filtering SPAM at the Exchange level, but each has its strengths and weaknesses. Some of the commercial anti spam products are Surf control, GFI Mail Essentials, Red Earth Policy Patrol etc. But it should also be noted that no one technique is a complete solution to the problem of spam and each has trade-offs between incorrectly rejected legitimate e-mail and not rejecting all spam, and the associated cost in terms of time and effort. Many anti spam products are commercially available in market.
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