>I haven't experimented much with the option "leave mail on server", in e-mail programs. This option can obviously be a hassle for the Web server (too much space used), so our ISP asks us to turn it off (every time we got a large e-mail, an automatic program on our ISP suspected that we left this option on <g>).
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>Will the option, "leave mail on server", cause additional problems? For instance - I don't know how these protocols work, but I have a suspicion that the e-mail client will have to retrieve a list of e-mails on the server which gets longer every time, and then compare this list to see which messages to download.
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>Does it seem practical to use this option, to have copies of e-mails in two different locations?

Hi Hilmar,

You can find all details in RFC 1939 - Post Office Protocol - Version 3 http://www.faqs.org/rfcs/rfc1939.html