The post office service that allows a traveler without a fixed address to collect his letter is known as
Answer Details
The post office service that allows a traveler without a fixed address to collect his letter is known as "poste restante". This service is used by people who do not have a permanent address or are traveling, and allows them to have their mail addressed to a post office. The recipient can then collect the mail from the post office by providing identification and proof of address. The term "poste restante" is derived from French, meaning "remaining post".