See: http://www.washingtonpost.com/wp-dyn/articles/A61759-2004Jun22.html
" Large Internet providers typically monitor traffic on their networks and pinpoint machines that are sending out inordinate amounts of e-mail. When such machines are found, some Internet providers block their Internet access until their owners come forward, at which point they are given help to remove the software code used by the spammers before being reconnected. The zombie problem, said representatives of the group, is going largely unchecked because other Internet providers are not taking such action. "We're throwing the gauntlet down," said Ken Hickman, senior mail director at Yahoo. "We're saying, 'Hey, secure your networks.' " The proposal suggests that Internet providers that are quarantining zombies might reject all mail from networks that are not doing so. "If the ISP does not reasonably control abusive traffic, it is at risk of being blocked by other ISPs," said the group's report. "These machines are a security risk," added Brian Sullivan, senior technical director of mail operations at AOL. Mike Jackman, executive director of the California ISP Association, responded that smaller Internet providers generally do watch their networks closely and act when they see zombies. "They are doing it because it's in their interest to do it," Jackman said. Spammers "are eating up bandwidth." " ================================================= So ASTA members are suffering as much as the rest of us, and their recommendatin is to block networks that spew spam and infections from subscribe IPs direct to our MXs. Where have we heard this before? For those of you who refuse (or are technically unable ) to block subscriber networks by PTR hostname, greylisting is proving to be incredibly, surprisingly effective. The subscriber network operator should block access from their networks to port 25, or we The Victims will/do block access from their networks to our MXs' port 25. A reject msg such as "554 Rejected for non-compliance with ASTA guidelines" would certainly help push the ASTA initiative into the network operators faces. Len
