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Article: 384
From: Scott Presnell
Date: 2005-03-14 16:23:00 -0500
Subject: milter-sender gets 550 when mx misunderstands as relay attempt

Removal...........: milters-request@milter.info?subject=remove
More information..: http://www.milter.info/#Support
--------------------------------------------------------

Hi,
	I'm using:

milter-sender[23116]: milter-sender/0.62.837 Copyright 2002, 2004 by Anthony Howe. All
rights reserved.
milter-sender[23116]: LibSnert/1.40.622 Copyright 1996, 2004 by Anthony Howe. All rights
reserved.
milter-sender[23116]: Sendmail libmilter Protocol version 2
milter-sender[23116]: Built with Berkeley DB

I find that I often get bit by a misconfiguration of the remote MTA so that the
MX verification is mistaken for a relay attempt.  Is there a way to trap and
sidestep this in the same way that MxCallBackIpBlocked is done?

Example:

reply 550 5.7.1 MX 1 'mail.foo.com.' [aa.bb.yy.xx] for <response@bar.org>
rejected address saying "<response@bar.org>... Relaying denied"

... e-mail is rejected.

	Thanks.

	- Scott

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