We are using an Exchange 2007 Edge Transport Server with Domain Lookup (to verify that the sender is actually who they say they are). We have one particular customer outside the company that is trying to email us, but she keeps getting these type of rejection messages ....
The following recipient(s) could not be reached:
email@example.com on 1/28/2008 4:47 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<naout-cinexs01.nasmtpout.emrsn.com #5.7.1 smtp;550 5.7.1 Sender ID (PRA) Domain Does Not Exist>
We have added her domains IP address into our allow list on the Edge Transport server, but that has not helped. We believe the problem may be due to the fact that her company passes their mail through Postini, so adding her IP address to our Edge Transport Allow list probably isn't doing much. She is going to try and check on the IP address Postini uses for forwarding mail, but I think it changes all the time. As far as I know, there's no way to globally accept email from firstname.lastname@example.org, or maybe *@domain.com? I guess that would cause problems when a spoofed email hits us from that address. Has anybody else ran into these error messages before or a similar type of situation? How did you resolve it?