bugtraq - Re: Is predictable spam filtering a vulnerability? (silently dropping messages)

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Date: Fri, 25 Jun 2004 15:49:27 -0400 (EDT)
From: der Mouse <mouse@...ents.Montreal.QC.CA>
To: bugtraq@...urityfocus.com
Subject: Re: Is predictable spam filtering a vulnerability? (silently
  dropping messages)

>> A 5xx failure code is a lot more friendly than actually generating a
>> DSN.
> Well, you're causing the sending/relaying host to generate the DSN.

Only if the sending host is running a real MTA.  If it's ratware
talking to you, it won't do anything of the sort.  _That_ is the real
gain of an SMTP-layer rejection over accept-and-bounce: it doesn't
generate DSNs when talking to ratware.

> Quite possibly back to some sod who has been joe-jobbed.

But in that respect it's no worse than generating a DSN yourself.
Better sometimes and no worse the other times - sounds like a win.

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