I have mail to one domain where I was getting this message.
Your message did not reach some or all of the intended recipients.
Subject: RE: Address
Sent: 11/13/2007 10:29 AM
The following recipient(s) could not be reached:
Keith Ford on 11/13/2007 10:29 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator. <OSW-EXCH.madill.oklahomasteel.com #5.7.1 smtp;550 5.7.1 Unable to relay for email@example.com>
So i went into the \\windows\system32\drivers\etc\hosts file and changed to where the email server should send email to this domain by their outside ip address and not the localhost.
Then after that it appeared to work until we got this message.
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
I have looked into my queues folder and see that the messages are sitting there being retried until they timeout and come up with an undeliverable message to be sent back to the sender.
This all started after we built a vpn tunnel between the two domains. Before the vpn tunnel it worked fine, but now mail both directions keep getting this same message. We built the tunnel because we have a few people who work at both places and so they would be able to log into either domain and get email, which works great. We just can't send email now from one domain to the other. Any ideas?