Isle of Man Post is warning its customers could be affected by industrial action in London today (Friday).
The Communications Workers Union has also announced action in Edinburgh, Bristol, Darlington, Stoke-on-Trent, Plymouth, Norfolk and Essex.
Post is being forwarded as normal but it may be delayed if it is being sent to an affeted area.
Normal service will resume on Saturday.
Paper car tax discs cost DOI £7,500 each month
Minister admits infrastructure is not in place to digitise process within this administration
Milan Vets extends farm services following feedback from clients
Services to continue beyond 1 November with update 'early in the New Year'
Just over half the vehicles examined were defective
Notices were issued for faulty lights, worn tyres, and a missing wheel nut
Health and care services meet at 'Home First' collaboration event
MCALS hosts Manx Care and third sector groups at The Roundhouse
Jason Roberts appointed as Clerk of Braddan Commissioners
Mr Roberts has been the Clerk to Port Erin Commissioners for 13 years