Re: Distributed spam-based DoS in progress
From: Valdis.Kletnieks@vt.edu
Date: 02/18/03
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To: Incidents Mailing List <incidents@securityfocus.com> From: Valdis.Kletnieks@vt.edu Date: Tue, 18 Feb 2003 14:48:38 -0500
On Tue, 18 Feb 2003 07:48:20 +0100, Hugo van der Kooij <hvdkooij@vanderkooij.org> said:
>
> Pardon me for noting that your mailserver seems to be broken.
>
> 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
Umm.. you're overlooking the case where you get a message, have to bounce it,
and the other end doesn't answer a SYN on port 25, so you have to sit on
it for several days before the message times out.....
So yes, the message *will* be discarded immediately - 5 days from now. ;)
-- Valdis Kletnieks Computer Systems Senior Engineer Virginia Tech
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