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After today, the next CWU strikes are due on August 31, meaning letter delivery will return to normal over the weekend.
But the action may have left a backlog in some deliveries, resulting in some post arriving later than intended.
And offices will remain closed, so while people will receive post, they cannot collect packages.
The Royal Mail said it may have to close hundreds of locations between Friday, August 26 and Saturday, August 27.
