As from this morning we are unable to receive e-mails externally. All internal e-mail is fine.
We are running SBS 2011.
MX Records are point to the server. I can't see any major error messages appearing in the Event Viewer.
I have re-run 'Set Up your Internet Address' but no good. I tried Telenet 25 and that has responded OK.
Is there anything else I can check to see what the problem is?