RE: Distributed spam-based DoS in progress

From: Dave Hart <davehart(at)davehart.com>
Date: Tue Feb 18 2003 - 14:28:30 EST

> From: Hugo van der Kooij [mailto:hvdkooij@vanderkooij.org]
[...]
> If a message is undeliverable it will be bounced BUT if the

Would you care to cite where it's said that NDRs and other MAIL FROM:<> messages must be discarded immediately if the first delivery attempt fails? The various mailers I have used continue to retry transmission until configured timeouts, as with any other outbound message. When the mail is an NDR being sent to a bogus domain (such as in response to spam with a forged sender email), it does clog up the queue for that timeout period.

Regards,
Dave Hart

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