Spam Filter For Express

• Fast rotating of ip addresses is used by some spammers to keep their websites from being traced and shut down.
• The spammer will set up reverse web proxies on many hosts, and then use name servers under his control to frequenty change which of these proxies will be pointed to by an official dns lookup for the site.
• Sender verification callout: A spam-prevention system in which the identity of the sender of incoming email is verified before the email is accepted.
• Because of their visibility, the portals will attract the spam complaints and may be shut down (if they haven't already been rotated out by the spammer), but the spammer can then simply set up more portals elsewhere without having to move his main site.
• Spam is the scourge of the internet.
• How much do spam filters cost? On average, spam filters cost approximately $25 to $40, depending on the features the program includes.
• A non-spam e-mail message that is falsely tagged as a spam message by a spam filter is called a false positive.
• Some researchers believe that based on an estimated current cost of $49 annually per inbox, the total cost of spam for businesses will balloon to $257 billion per year if spam continues to flourish at its current rate.
• Some anti-spam software can send greylisted addresses an automated response, challenging the sender to confirm their legitimacy.
• If you can see how ineffective our current spam legislation is, you might think spam will always be a problem, at least as long as we allow useless laws to regulate it.
• Graylisting requires a bit of extra work by the mx (particularly for large mailing services that must coordinate among many mx hosts), but possibly not as much cpu time as would be required to process and filter the spam if it were not rejected.

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