"As per the rules, if anyone forgets their Ps and Qs or fails to say 'thank you', they will promptly be told to leave," the Daily Mail reports.
"I believe that when people enter the town hall, they should comply with certain common courtesies, such as wishing people good morning, saying goodbye," Mayor Plee said.
"If I don't introduce this rule I have no power to take action against these people because there is no law in France that forces people to say hello, and there's no judge who will condemn someone for not saying it," he added.
He added he introduced the rule after an incident at the town hall where a visitor was rude.
Anotice has now been pinned up outside the door of the town hall warning visitors of the consequences of any rudeness.
"Visitors to the Lh'raule municipal offices are required to comply with and observe the social norms of politeness and courtesy...especially by greeting municipal staff upon entering the premises," it read. The notice said if someone failed to comply with these norms, they would be requested to leave the premises.