A specialised British mail provider is The British Forces Post Office (BFPO). It is an agency that provides a postal service to HM Forces, separate from that provided by Royal Mail. BFPO addresses are used for the delivery of mail in the UK and around the world.

The BFPO has developed a hybrid form of mail, known as ‘e-Bluey’, in which letters can be sent directly by e-mail to the BFPO, and then dispatched to the recipient via the traditional postal system.