Spammers outwit blacklist strategy

Monday, 14 February 2005, 12:36 PM EST

The latest version of Send-Safe, the notorious bulk-mailing software used by many spammers, has a feature that renders the "blacklist" strategy used by email filtering companies obsolete.

Using the blacklist strategy, all emails from a computer known to send out spam are blocked before they reach internet service providers' systems. Most of these emails come from infected PCs - called "zombies" - controlled by the spammers. Send-Safe, however, now disguises the origin of emails to make it seem like they are coming from the zombie's ISP instead of the infected machine.

By Reuben Schwarz at Stuff.

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