Method for processing at least two IMAP data flows, the IMAP data flows being exchanged via an internet network between an electronic mail server and at least two remote clients (1, 1') respectively using a first and a second separate proprietary IMAP protocol, each IMAP data flow respectively corresponding to a connection of a respective remote client to an electronic mailbox, the method being characterized in that it comprises a translation step including: a first sub-step carried out by an analysis module, consisting of the extraction of proprietary protocol data from an IMAP data flow and comprising the extraction of a request to deliver an electronic mail identified by an electronic mail identifier, a second sub-step consisting of the execution of at least one task relating to the extracted proprietary protocol data by a proprietary IMAP application module exchanging data with at least one storage server (4, 5) via a network in order to obtain proprietary protocol response data, said sub-step including the operations of: obtaining data to be encapsulated and message attribute data from at least one storage server (4, 5), said data being associated with the electronic mail identifier, and generating the electronic mail from the data to be encapsulated and the message attribute data, and a third sub-step carried out by the analysis module, consisting of the generation of a return IMAP data flow from the proprietary protocol response data and comprising the transmission of said electronic mail to the remote client (1, 1'), said proprietary IMAP application module being selected from among a first and a second proprietary IMAP application module, the first proprietary IMAP application module being adapted to execute tasks relating to the first proprietary IMAP protocol, the second proprietary IMAP application module being adapted to execute tasks relating to the second proprietary IMAP protocol. a first sub-step carried out by an analysis module, consisting of the extraction of proprietary protocol data from an IMAP data flow and comprising the extraction of a request to deliver an electronic mail identified by an electronic mail identifier, a second sub-step consisting of the execution of at least one task relating to the extracted proprietary protocol data by a proprietary IMAP application module exchanging data with at least one storage server (4, 5) via a network in order to obtain proprietary protocol response data, said sub-step including the operations of: obtaining data to be encapsulated and message attribute data from at least one storage server (4, 5), said data being associated with the electronic mail identifier, and generating the electronic mail from the data to be encapsulated and the message attribute data, and obtaining data to be encapsulated and message attribute data from at least one storage server (4, 5), said data being associated with the electronic mail identifier, and generating the electronic mail from the data to be encapsulated and the message attribute data, and a third sub-step carried out by the analysis module, consisting of the generation of a return IMAP data flow from the proprietary protocol response data and comprising the transmission of said electronic mail to the remote client (1, 1'), said proprietary IMAP application module being selected from among a first and a second proprietary IMAP application module, the first proprietary IMAP application module being adapted to execute tasks relating to the first proprietary IMAP protocol, the second proprietary IMAP application module being adapted to execute tasks relating to the second proprietary IMAP protocol.