Urgent Exchange Help

MikeHiow · 21 Nov 2011 at 09:23

I just switched over from using our ISPs SMTP server as a smart host to the DNS record option to send mail directly.

I edited the only send connector under organization -> hub transport.

I'm not even sure where to go from here? Changing back to a smart connector doesn't appear to resolve the issue.

Please help an exchange noob

MikeHiow · 21 Nov 2011 at 09:27

Oh, in my panic, I forgot to include that part

All outgoing emails are coming back as undeliverable and #550 5.7.1 Unable to relay ##

MikeHiow · 21 Nov 2011 at 09:40

Not sure what that is for, but I'm using Exchange 2010, and that doesn't seem like anything I've got?

MikeHiow · 21 Nov 2011 at 09:51

Problem solved.

It appeared to be a weird issue with the router and some existing port forwarding rules causing everything outgoing on port 25 to loop back to the mail server.

Thanks for your help people