12/3, not 12/4 ... Here are your 'angry tweets' from customers -- a sampling of what Stamps was replying to on 12/3 (links removed for posting):
Wow, not a good day for Stamps to be down...
StampsCom ah -- working but very slowly and some services are not available right now
Annnnd Stamps f***s me again with lousy service. What a joke.
I've got packages to ship and Stamps is down!