Hi, I've got a nightmare situation where a client's new (21 days old) SBS 2011/Exchange Server is no longer working.
DNS is correct. RBL checks are all green. Exchange Transport is on.
Restarting transport does nothing.
Restarting the server allows e-mail within the domain but not from outside.
I have issues against SHAREPOINT. Other users have commented on this but don't know if relevant.
Server running at 2% processor load and 50% memory.