Heathfield Post Office closed unexpectedly over the Easter weekend.
A note in the Station Road window advises customers their nearest Post Offices are Hailsham, Broad Oak and Mayfield.
This means there are no post office services available to people living in the town who do not have transport to access alternative branches several miles away.
A Post Office spokesperson said: “Heathfield Post Office at The Mews, Station Road, Heathfield, closed temporarily on April 1, due to a situation beyond our control.
“The closure was unplanned.
“We are urgently looking at ways to restore Post Office services to Heathfield as soon as possible. T
“he nearest alternative branch is Broad Oak, Heathfield, TN21 8SU, which is open Monday to Friday: 9am–5.30pm; Saturday: 9am–12.30pm.”