Our wonderful (soon to be "ex") ISP released a big chunk of IPs (including all ours plus our mailserver's) back to the company they bought them from originally.
John's been working to get us back on the net and our mailservers up again. We've been without internet since Friday, and he got us back on (temporarily) yesterday afternoon. We should (fingers crossed) be fully operational again by this afternoon.
As for emails, there's a good chance they didn't make it through, and we don't have an alternate in the meantime...