Paston Post Office, inside the Chadburn Centre, is temporarily closed.
The post office, which is based inside a convenience store, has been shut since May 11.
A Post Office spokesperson said: “Paston Post Office has been temporarily closed since May 11 due to the ill-health of the postmaster, who has now resigned.
“We apologise for any inconvenience caused by the unplanned closure. We are working hard to restore the service as soon as possible.”
To see your nearest post office branch, visit http://www.postoffice.co.uk/branch-finder.