More than 13,000 workers walked out in the capital yesterday after a local dispute at the north-west London sorting office in Camden about working practices escalated, forcing the Post Office to seal many post boxes.
Deliveries in the London area were disrupted by the action which is also likely to affect deliveries in the capital and elsewhere today.
After talks between management and national officials of the Union of Communication Workers, a peace deal was reached last night and was due to be put to a meeting of workers in north-west London this morning.
The union urged all other postal workers in London who took sympathy strike action to return to work as normal tomorrow.
The dispute, over the introduction of a new computer system which workers complained increased their work load, went ahead in spite of a court injunction against illegal sympathy strikes obtained by the Post Office.