[Dovecot] UIDL documentation

[Timo Sirainen]

On Mon, 2006-04-17 at 16:56 -0400, Mark E. Mallett wrote:
> and on the wiki at http://wiki.dovecot.org/Migration there is this:
> 
>   By default Dovecot generates POP3 UIDs differently than UW-IMAP. If
>   you want to preserve them, with 0.99.x you'll have to patch Dovecot.
>   With 1.0-tests you can use:
> 
>   pop3_uidl_format = %08Xv%08Xu
> 
> In the dovecot-example.conf file, it appears that the mentions of
> "%08Xu%08Xv" as being fail-safe and being the new default may be typos,
> since that format doesn't seem to come from anywhere.  Should they not
> say "%08Xv%08Xu" ?  (It'll still provide the same sort of unique value,
> only with the ends reversed; i.e. it should still work ok.  But
> consistency and compatibility is nice.)

No, it's actually correct although it's not compatible with anything
else. The point is that %08Xv (== UIDVALIDITY) is always the same for
user's all mails (usually forever), so if there are some stupid clients
which truncate the POP3 UIDL value, it's safer to have %08Xu (== UID)
first. Outlook apparently in some situations truncates the UIDL which is
causing problems..
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