[Dovecot] Question about the pop3 feature "leave messages on server for a certain period of time"

Hi all

I am missing something on the the pop3 "leave messages" rationale.

Although the UIDL feature solves for the MUA the problem "whch mails should be downloaded", how the duration that these mails should be kept on server, say 10 days for one MUA and 20 days for another MUA for the same account, is resolved on the server?

thanks in advance

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