The sign has been on the postbox for at least four months, according to a Google Maps photo taken in July.
The message taped to it said: “Whilst you are very welcome to continue using this postbox, we wanted to mention that your letter may not arrive without some nibble marks around the edges.”
According to one villager, who did not want to be named, the overhanging vegetation on the wall encouraged the snails to invade. The problem had persisted for at least a year and had not been discussed by the parish council, they said.
Residents can post their mail at the village post office, which has not yet been visited by snails.
In Cornwall, residents of Marazion recently found their postboxes had been sealed off to keep invaders out., external