I believe this problem has been hashed over before but I don't understand why it will not work properly. I have a client with a SBS 2003 server. Because of a email compliance issue I need to send mail thru their trusted mail host. Each email user must send using their own username and password to send mail thru this host so the mail will be archived properly additionally they reject mail if sender, username and password do not match. I have set up multiple SMTP connectors for each user (each with the appropriate credentials and verified they work by themselves by setting the cost higher on all other connectors), I set the same SMTP cost of 1. I have set delivery restrictions so that each connector will reject mail from all but accept mail from the intended user. I have edited the registry for
HKLM\SYSTEM\CurrentControlSet\Services\RESvc\Parameters\CheckConnectorRestrictions to 1 (DWORD)
and restarted the server. It works at first but then falls apart with NDR's like the one below.
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<xxxxxxxxxxxxxx.com #5.7.1 smtp;550 5.7.1 Client does not have permissions to send as this sender>
I wish there was a 3rd party utility to fix this or if it would just work as advertised that would be great.
It appears to start ignoring the delivery restrictions at some point and going through the wrong connector. Why would this be. There must be a way to fix this.