Curious about POP server workings

Discussion in 'Computer Support' started by Jack B. Pollack, Apr 1, 2006.

  1. I am curious and just looking for a simple several sentence explanation
    regarding these behaviors on POP servers:

    1. In an email client if you select "leave a copy on the mail server" you
    will obviously will only receive the message once using that email client,
    but if you then check the same POP account again with another computer you
    will receive the old messages.

    Is this behavior controlled on the server side or the client side? If it is
    on the server side how does the server know if the mail has already been
    downloaded by THIS client?

    2. And along the same lines, if you select "delete messages after X days" is
    the delete initiated by the server or client software?


    Thanks
     
    Jack B. Pollack, Apr 1, 2006
    #1
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  2. Jack B. Pollack

    Mara Guest

    It's controlled by your client. The messages are stored on the server. If you
    elect to leave the messages on the server, you client will then download a copy
    of the message, leaving the original on the server.
    That someone else will have to answer to be sure. I've never paid attention to
    it.
     
    Mara, Apr 1, 2006
    #2
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  3. When you use an email client on a different computer, that client is not
    aware that another computer/client has already retrieved the mail. As
    long as the server holds the mail, you will retrieve a copy on the
    second computer.
    Client side.
    Does not apply; the client controls all of this.
    Again, it is all controlled by the client. The server is merely a
    repository for the mail.

    Some ISPs' servers will have a "delete messages older than NN days"
    though. One of mine will auto-delete messages at the server that are
    over 30 days old, from the Inbox.
     
    Beauregard T. Shagnasty, Apr 1, 2006
    #3
  4. Jack B. Pollack

    Whiskers Guest

    .... and some email services (ISP and independent) may have a web interface
    from which the user can set the 'default purging' behaviour.
     
    Whiskers, Apr 1, 2006
    #4
  5. Jack B. Pollack

    Dan Evans Guest

    Both sides. The client gets the list of mail on the server, and only
    downloads the mail with message ID's it doesn't have (retr 27, retr 28 etc)
    The client, by looking at the mail date, todays date, and issuing DELE (dele
    1 dele 2 etc) for each message that is older than X

    Turn on logging in your favourite mail client, then look at the logs.

    Dan





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    Dan Evans, Apr 2, 2006
    #5
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