I have setup a new instance of SBS 2011 Standard
I have updated my DNS/MX records to reflect the new exchange server being now in house.
I can send email without a problem from within the local network. However clients who have their Mail client setup for POP and pointed to the new server are not able to send email, they get the following error:
Your message did not reach some or all of the intended recipients.
Sent: 9/5/2011 2:04 AM
The following recipient(s) cannot be reached:
David Brown on 9/5/2011 2:05 AM
Server error: '550 5.7.1 Unable to relay'
We haven’t cut all over to exchange yet, and wanted to keep the POP settings still active for now, this way users can keep going with their current settings but pointing to the new server via the DNS records update we did.
Any ideas why from outside the network so not using exchange config on client I am not able to send email?
Thanks in advance