Im stumped! Never seen this before.
I have the following setup. 2 Mailbox's and 2 Cashub's, both clustered. Mails are sent and received via postini. Storage is common (MSA).
It started by slowly where external emails stopped being delivered. then users could not even send internal emails.
As of now, I can only receive external emails. Cannot send internal or external emails. Tried disabling the smarthost (Postini, since we have a static IP) as well. No go.
I have shut down and restarted the storage and all the server's. Same issue.
There is no NDR, nothing in the outbox or the Q's either
Any help would be great.