dovecot - Feb 2004 - X-UID

What is the function of the X-UID header in mbox format?

Mozilla Thunderbird 0.5 seems to regard it as a simple numbering of the
messages; i.e., that the first message in the mbox should have X-UID: 1.

Dovecot seems to treat it simply as an ordered unique identifier. Thus,
the first message in my actual mbox has X-UID: 3849658. (There are only
a few dozen messages in the box.)

Running Thunderbird 0.5 against a Dovecot IMAP server with mbox format,
Thunderbird displays these UID numbers in the message list, which is
fairly useless -- I want a numbered list of my messages starting at 1
(which Pine, for example, is happy to provide).

I'm just wondering whether this is Dovecot's fault, Thunderbird's
fault,
or an ambiguity in the mbox standard.

thanks,
	Paul

On Wed, 2004-02-11 at 17:37, Paul Adams wrote:
> What is the function of the X-UID header in mbox format?
Dovecot gets IMAP UID from it. The header isn't supposed to be sent to
clients at all, but the current code still does..
> Running Thunderbird 0.5 against a Dovecot IMAP server with mbox format,
> Thunderbird displays these UID numbers in the message list, which is
> fairly useless -- I want a numbered list of my messages starting at 1
> (which Pine, for example, is happy to provide).
Does Thunderbird actually use the X-UID header, not just the IMAP UID
that gets sent separately? If the X-UID header is the problem, it's then
Dovecot bug that it shows the header to Thunderbird.

If Thunderbird just uses IMAP UID and shows it, I agree it's pretty
useless but that's for Thunderbird to fix.
> I'm just wondering whether this is Dovecot's fault,
Thunderbird's fault,
> or an ambiguity in the mbox standard.
IMAP clients shouldn't know anything about what kind of mailbox format
is being used in server side.

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