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Re: [bug-mailutils] movemail --keep-messages --uidl download the same

From: Sergey Poznyakoff
Subject: Re: [bug-mailutils] movemail --keep-messages --uidl download the same
Date: Wed, 18 Nov 2020 20:19:39 +0200

Irek <mail@gumen.pl> ha escrit:

> I don't know if you have any plans to add support for Message-ID, but it
> sounds like different topic anyway.

Message-ID is not guaranteed to be globally unique, so it cannot be
reliably used to identify messages.  Besides, POP3 protocol does not
provide a command for listing Message-IDs of the messages in the mailbox
(as it does provide a command for UIDL).  The only way to obtain them
would be to issue a STAT command first, and then, for each message in
the mailbox, issue a "TOP msg n" command.  What's worse, the value of
n is not known beforehand.  So no, unfortunately it cannot be used.


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