No mail will be collected or delivered today, as part of the Island's 'Supermanx' bank holiday weekend.
It comes as all sub post offices across the Island are also closed.
Normal deliveries and opening hours, however will resume tomorrow.
The Customer Services Suite at Post Office Headquarters and the Northern Delivery Office are also closed.
Repairs on Peel Power Station to get underway
Manx Care doctor survey to be discussed by Tynwald
Weather warning for snow tonight
MHK queries safety at primary school in Ballabeg
Gales put two ferry sailings at risk tonight
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night