[miles]

They've definitely gone downhill since their peak, but Rackspace still has decent, US-based phone support. Called about a sub-account user who had had their mailbox frozen; re-enabling the account via the control panel was of course no problem, but the cool part was this: the support rep was able to find and confirm the source of the problem (a group message which had been flagged as spam by some number of recipients). I haven't seen many other email hosts that can provide this level of detail.