> From: Hugo van der Kooij [mailto:hvdkooijat_private] > Sent: Tuesday 18 February 2003 06:48 [...] > If a message is undeliverable it will be bounced BUT if the > bounce message > can not be delivered it will be discarded immediatly to > prevent double > bounce loops. > > See also RFC 2821 section 4.5.5 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 ---------------------------------------------------------------------------- This list is provided by the SecurityFocus ARIS analyzer service. For more information on this free incident handling, management and tracking system please see: http://aris.securityfocus.com
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