The Doha exchange server was giving users this message this morning:-
Your message did not reach some or all of the intended recipients.
Sent: 1/29/2012 10:20 AM
The following recipient(s) cannot be reached:
firstname.lastname@example.org on 1/29/2012 10:22 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<qatdoh-mb01.kinnad.ae #5.7.1 smtp;550 5.7.1 Unable to relay for
After looking in:-
System Manager -> Administrative Groups -> Servers -> DUBBUR-MB02 (Main External Routing Gateway for Exchange) -> Protocols -> SMTP – > Right Click “Default SMTP Virtual Server -> Properties -> Access -> Relay
I could see that 192.168.100.21 was enabled to relay through DUBBUR-MB02.
On further investigation, i could see that QATDOH-MB01 had 2 nics enabled. One was 192.168.100.21 and the other was dynamic 192.168.210.127.
I disabled this nic and the relay started working again.
Thank you and good night!