Posties are set to walk out on strike at least 19 more times over a pay deal which fails to recognise the cost-of-living crisis.
Union leaders have asked the public to "stand with their local postal worker" as they continue the "fight of their lives".
The Communication Workers Union (CWU), which represents Royal Mail workers, said strikes featuring all workers will take place on 13, 20, and 25 October, and 28 November.
