I have a (non-Exchange) mail server which works fine. But some people cannot send us emails when they use Exchange. We don't see any connection attempt to our mail server from their SMTP server. I think it may be a DNS problem, because we have a custom DNS server on our side (for the domain powermail.fr), but I have no Exchange server to debug the issue. Did someone already had this kind of problem ? Can someone try to send me an email on test 'at' cyber-tamtam.net from an Exchange server and, if it fails, track down all the delivery process ?
Here is a bounce message returned to a sender by Exchange :
Reporting-MTA: dns;SRV-FW02.otherdomain.com Received-From-MTA: dns;SRV-EXCHCAS01.otherdomain.com Arrival-Date: Mon, 23 Jan 2012 15:20:50 +0000 Final-Recipient: rfc822;firstname.lastname@example.org Action: delayed Status: 4.4.7 Diagnostic-Code: smtp;400 4.4.7 Message delayed Will-Retry-Until: Wed, 25 Jan 2012 16:20:50 +0100
Thanks a lot !!