Take a look at that RFC I have mentioned.

ftp://ftp.rfc-editor.org/in-notes/rfc1225.txt


They wrote an example POP3 Session, I had extended it a bit with some
comments for you:

    S: <wait for connection on TCP port 110>
        ...
    C: <open connection>
    S:    +OK dewey POP3 server ready (Comments to: PostMaster@UDEL.EDU)
    C:    USER mrose
    S:    +OK mrose is a real hoopy frood
    C:    PASS secret
    S:    +OK mrose's maildrop has 2 messages (320 octets)
    C:    STAT
    S:    +OK 2 320

now you know you have two messages in the server...

    C:    LIST
    S:    +OK 2 messages (320 octets)
    S:    1 120
    S:    2 200

OK, so you know the size of the messages, you can select any message
that exceeds the size of x to be deleted, or read it:

    S:    .
    C:    RETR 1
    S:    +OK 120 octets
    S:    <the POP3 server sends message 1>
    S:    .

...or use TOP command:

    C:    TOP 1
    S:    +OK
    S:    <the POP3 server sends the headers of the
          message, a blank line, and the first 10 lines
          of the body of the message>
    S:    .

Now delete that message

    C:    DELE 1
    S:    +OK message 1 deleted

...and continue iteration till you have finished with all mails...

    C:    RETR 2
    S:    +OK 200 octets
    S:    <the POP3 server sends message 2>
    S:    .
    C:    DELE 2
    S:    +OK message 2 deleted
    C:    QUIT
    S:    +OK dewey POP3 server signing off (maildrop empty)
    C:  <close connection>
    S:  <wait for next connection>

That's as simple as that, just a matter of text parsing and to
conversion from ascii to numeric (number of messages, size etc)

Regards,

Tamas
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