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emailparameterscommandprotocolsimap

What argument can stands before the client command in IMAP4?

I'm reading RFC 3501 and there are many examples like this:

C: a001 LOGIN SMITH SESAME
S: a001 OK LOGIN completed

So, what is this a001 before the command LOGIN?

Solution

  • The command's tag, chosen by the client. IMAP permits clients to issue several commands at the same time. The server processes all, and then reports to the client that a particular command is now done.

    C: a001 LOGIN SMITH SESAME

    A new command starts, tagged a001.

    S: a001 OK human-readable text goes here

    Command a001 is now done, without errors.