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Re: mail forwarding loop: how do I prevent this?

From: Wietse Venema (wietseporcupine.org)
Date: Sat Jul 21 2007 - 08:35:26 CDT


Justin Piszcz:
> Jul 21 07:20:49 l2 postfix/local[4079]: 96AF0C08489B:
> to=<apsolarrain.com>, relay=local, delay=12, delays=12/0.01/0/0.04,
> dsn=5.4.6, status=bounced (mail forwarding loop for apsolarrain.com)

This means that mail for the ENVELOPE recipient addresss apsolarrain.com
already had a message HEADER line with:

    Delivered-To: apsolarrain.com

(actually, the comparisons of header label and recipient address
are case insensitive).

This means one of the following:

- The mail was already delivered SOMEWHERE, perhaps on a different
machine, to a recipient apsolarrain.com.

- Someone sent mail with 'Delivered-To: apsolarrain.com' even
though it was never delivered there. Reportedly some spam or virus
software does such things but I have not noticed this myself.

        Wietse