[Dovecot] quetion about duplicate messages

[Chris Wakelin]

Different POP servers use different ways of generating UIDL values for 
messages, which is what the client uses to decide whether it already has 
a particular message. In version 1.0-tests/1.0-stable, Dovecot can 
emulate many of them (but not Qpopper, which uses a MD5 hash of some of 
the message headers). To emulate UW-IMAP set

pop3_uidl_format = %08Xu%08Xv

in dovecot.conf, rather than the default %v.%u, which is what Cyrus uses 
(see dovecot-example.conf).

If you're using Dovecot 0.99 or were using Qpopper (we're doing the 
latter!) then you'll have to grin and bear it - it'll teach your users 
not to abuse the POP protocol by leaving mail on the server - that's 
what IMAP's for ;-)

Best Wishes,
Chris

Michiel van Es wrote:
> Hi,
> we recently switched from Imap-Uw to Dovecot as a pop3 server.
> I was wondering why people who have the flag 'Leave messages on server' 
> in their email client (Outlook, Outlook Expres) that they receive 
> duplicates of their stored mail?
> Is it because Dovecot doesn't know that the messages has already been 
> popped by Imap Uw or is the email client which thinks there are new 
> messages on the server and if so..how can I avoid this behaviour?
> 
> Thanks in advance for any help.


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Christopher Wakelin,                           c.d.wakelin at reading.ac.uk
IT Services Centre, The University of Reading,  Tel: +44 (0)118 378 8439
Whiteknights, Reading, RG6 2AF, UK              Fax: +44 (0)118 975 3094