>The US Postal Service is closed for Martin Luther King Jr’s Birthday.
http://www.usps.com/communications/news/uspscalendar.htm

TekGems recognizes Martin Luther King Jr’s birthday, but we do not observe it. Since the post office is closed, we recommend you select UPS as a shipping method if you want your packages processed on Monday. All pending shipments with US Postal Service shipping methods will ship on Tuesday, January 16th.

The other shipping carriers such as UPS, FedEx, and DHL are open for business:

UPS Holiday Schedule
FedEx Holiday Calendar
DHL Holiday Calendar