The mail server is having an issue at the moment. You will see different symptoms, but they are all “unusual”.
This has apparently been happening for about 24 hours now. Under normal circumstance we would have worked on the problem close to 24 hours ago now, but unfortunately our office network is currently not fully usable at the moment, so we can’t.
What we can tell you at this point is that outgoing messages are going out, even if you see errors that seem to indicate otherwise.
We are currently working on all three of the “perfect storms” to address this issue. I hope I’ll have an update for you within the next couple of hours.