[Oberon] Re: POP use of UIDL command ?
easlab at absamail.co.za
Mon Mar 12 03:59:16 MET 2007
news at absamail.co.za writes:
> > It's not clear to me from my RFCs: 1939, 1725, 2449 how the
> > [list unique IDs of mails still on the server] UIDL is used.
> It's for mail clients that cache message's contents. A mail client that
> sees a UIDL for the first time recognizes that it's a new message, and will
> download it. A mail client that already saw the same UIDL will not need to
> download its contents again, because it already has it.
> Recording each message's UIDL is still useful even if the mail client always
> deletes messages, after downloading them from a POP3 maildrop. If there's
> an exception that interrupted the download process, messages that were
> downloaded will still remain on the server (pay careful attention to how
> DELE and QUIT works); and the next time the client reconnects it will
> otherwise end up downloading duplicate copies of some of the messages.
> Recording each message UIDLs will prevent that, since the mail client will
> easily recognize message that it already has, making the POP3 mail download
> process essentially bulletproof.
-- yes, the delete only happens after a successful 'log out'.
PS. linux groups are quiet strong for inet queries.
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