Enrico Pasqualotto writes:

Hi all, I have set up some mail server with gentoo+postfix+courier+mysql
  on my client.
One of this use the features "Leave messages on server" for read mail
with webmail when he's out of office.
Two days ago your mail client (Outlook) have download all old mail
(>2000) that you have already read.
This is the second time that I see this issue, can anyone explain me why
is verify this problem?

Why exactly do you believe that this is a problem with the server, instead of a problem with Outlook?

Solution?

P.S.

In witch way the client know the mail already read?

The server maintains a unique identifier for each message. Each mail client keeps track of which unique identifiers it's seen already, and use them to identify messages it has not seen yet.

Generally, POP3 is the wrong protocol for keeping mail on the server. This is what IMAP is for.

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