Just some FYI.
If you received a bunch of emails or was waiting on some to come in that didn't, this was caused by a reconfiguration we did late last night in attempt to fix our intermittent availability.
Inevitably, the root problem had nothing to do with our server, but instead someone added a "fix" to the network router with a conflicting MAC address entry. So both systems were going offline every 5 minutes.
The problems have been resolved and the mailing system should be active again and any queued messages will be sent out.
Let me know if you have any related problems and I'll be happy to help fix them.