Well, as a cost saving measure and because we really weren’t using more than one, we’ve cut back to a single IP address. Time Warner Cable is the biz Internet provider. They’ve been very helpful in setting up reverse DNS lookups and PTR records, but at the same time the transfer to the new IP really screwed with the cable modem.
I spent many hours with some very nice people at TWC tech support, like Jan, but what eventually fixed the problem was changing the fixed IP I was assigned to another fixed IP.
Long and short is everything, mail, web, etc. seems to be back up and running.