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.
Amber weather warning issued as strong winds and coastal conditions expected overnight
Ferry sailings cancelled as gusts of up to 80mph forecast, with risk of coastal overtopping in exposed areas
Hospice funding criticised by UK charity chief amid Isle of Man service cuts
Comments come as Hospice Isle of Man confirms redundancies and financial pressures
Sailings cancelled as storm brings gale-force winds
Yellow warning issued with gusts up to 80mph expected in exposed areas
Manx Mountain Marathon route diverted over safety concerns amid forecast strong winds
Organisers alter coastal section of course ahead of Saturday’s races as conditions expected to worsen