keric@cyberiron.com (Eric Anderson) writes:

Not to mention being the ultimate DoS: sending out loads of useless SPAM that appears to come from a competitor, getting them kicked off their Net.

The RBL team has occasionally received and followed up on some spam, traced it back through multiple providers, only to discover that it was forged by a somebody's competitor. We blackholed the real source in those cases, not the forged source. The telephone is a marvelous tool for figuring out what really happened, and our use of the phone is one of the things that makes the RBL so difficult to maintain. -- Paul Vixie <paul@vix.com>