Thanks Robert. And you are correct - the exchange rejects mail destined to non-existent mailboxes!
Due to lack of time, I have not yet found a quick method to have sendmail authenticate against active directory so I've instructed sendmail to relay all mail and leave it to exchange to deal with rejection and NDR's. <OT> Any chance you know of a quick and dirty method to implement sendmail AD authentication? I did search during build of the sendmail box, but did not find conclusive instructions to do so - possibly because I was under immense pressure to get a spam identifier installed. </OT> Cheers, AK. -----Original Message----- From: Robert - eLists [mailto:[EMAIL PROTECTED] Sent: Thursday, 14 June 2007 10:47 AM To: users@spamassassin.apache.org Subject: RE: Problems with Received: header checks and ALL_TRUSTED rule... AK, The MTA should not accept email for non existent email addresses - rh
