Postal deliveries across parts of Yorkshire are expected to return to normal on Thursday after a series of wildcat strikes came to an end.
About 300 staff took unofficial action at the centre
Workers at the Royal Mail's Yorkshire Distribution Centre, at Normanton, returned to work on Wednesday evening.
About 300 workers at the centre walked out on Monday afternoon after a localised dispute over working hours.
A settlement was reached between union negotiators and local management over the dispute at the Wakefield operation.