Market Deeping post office has been closed for more than a week after the sub-postmaster resigned suddenly.
The branch in Church Street did not open on Monday, with a note on the door directing customers to the office in Bourne.
A spokesman for the Post Office said: “We would like to apologise for any inconvenience caused by the temporary closure of the Post Office branch in Market Deeping which is due to the sudden resignation of the subpostmaster.
“We are now exploring options that would enable us to restore the service to the community as soon as possible. We would like to reassure customers that we are committed to maintaining services in the area.”
The nearest branch for Market Deeping residents is in Church Street, Deeping St James.