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Re: ISP wants to stop outgoing web based spam
On Thu, 10 Aug 2006, Ken Simpson wrote:
I've had a a situation in the past that required this same application. I ended up using amavisd-new with custom views for incoming and outgoing mail. For spam originating from inside, it was dropped completely, for spam originating from the outside, subject was rewritten.
I'll answer on-list since this answer can benefit others. The primary reason that the ISP wants to block outbound webmail spam is because the 100s of BLs on the Internet end up blocking large segments of the IP space due to spam reporting by end users. The spammer can end up "burning" quite a few IPs before the feedback loop of user->spam report->BL->ISP->block is completed. Therefore the ISP wants to be proactive and shut off the spam before it even starts. Even if it means losing revenue.
Hank Nussbacher http://www.interall.co.il