Hello, I am having a strange problem as this server was configured and working 3 days ago is not getting any external email. It was working fine Friday night and now if try to send from Exchange server, the messages just sit in the queue and are not able to be delivered. I have not changed anything and as far as I know, nothing else has changed anywhere. Is there somewhere in Exchange 2007 that I can control the connections like I did in Exchange 2003? I cannot find what the issue is and have run out of places to look.
Also, if this helps, When I run a telnet test, everything is Ok until to try to email my self from the problem server and I get, Unable to relay. Where is that being controlled at?
Here is the Telnet test I did.
220 mail.domain.com Microsoft ESMTP MAIL Service ready at Mon, 11 Jul 2011 13:
250-mail.domain.com Hello [x.x.x.x External IP]
250 2.1.0 Sender OK
550 5.7.1 Unable to relay
Thank you in advance for any help....