A method is provided for allocating a messaging mailbox located in a communications network to a user. The method performs the following actions in a messaging mailbox management device: receiving from a communication terminal, via the communications network, a request for a messaging mailbox, the request including user identification information, the identification information being different from a contact identifier of the user that can be reached on a communications network of a telecommunications operator to which the user subscribes; recording the received identification information in association with a messaging mailbox identifier; and sending a message in reply to the request, via the communications network, to the communication terminal. The message includes the messaging mailbox identifier.
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