It seems that the network connected to VPOP's system is completely down. This means that no mail or web traffic is making it in or out. We are working with our upstream provider now to get the problem resolved and will post an update here as soon as we have one.
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UPDATE [9:24am] Things are back up. Although the outage was less than 15 minutes it was a complete outage. I'm still trying to find out the details from our upstream but for now, we're up.

-tom