USPS web sites down

Update: A USPS spokesperson posted the following on our Facebook wall just after midnight:

USPS web sites up and running. The issue impacting several USPS online applications on Sunday has been resolved. If customers have questions, contact the Help Desk at 800-522-9085.

Some USPS web sites that handle customer transactions, such as tracking, buying stamps, and locating a post office are unavailable this afternoon. Intellisent’s blog reported that the Postal One! system was undergoing unscheduled downtime early this afternoon:

… and postal commentator Alan Robinson noted that there was a rash of complaints online about USPS services being unavailable.