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Obeying SPF for relaying customers

To: qmail@list.cr.yp.to
Subject: Obeying SPF for relaying customers
From: Oliver Welter <mail@oliwel.de>
Date: Fri, 18 May 2007 15:49:03 +0200
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Hi Folks

Big trouble here - I have a customer that relays through my server.
He relays using the address of his employeer as sender and sends mails to other people at this employeer. Their server has published SPF records and the Spam Wall blacklists me because I am trying to send mail that breaks the SPF rules.

Is there a trick to ensure that relaying people can use only local domains as sender address or at least to reject mails based on SPF ?

I am runnin netqmail with qmail-scanner

Oliver

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