[Kde-pim] Non-standard IMAP flags in KMail

[Volker Krause]

Hi,

we (KDAB) have been implemeting support for storing all message status flags 
of KMail on an IMAP server that supports custom flags (such as cyrus and thus 
the Kolab server). So far only standard IMAP flags (seen, answered, 
important) haven been stored there. For the non-standard flags (todo, 
forwarded, ignored, watched) we have been looking at what IMAP flags other 
mail clients use, with the following results:

- Thunderbird uses $labelN
- Outlook 2007 is claimed to support only one flag for IMAP items, no idea if 
this is correct, but it would mean there is no support for custom IMAP flags.
- there is a draft dealing with extended IMAP flags: 
http://tools.ietf.org/html/draft-melnikov-imap-keywords-03 
However, this still does not cover all flags we need (watched and ignored are 
missing).

Has anyone additional information on that topic, ie. which mail client uses 
what additional IMAP flags?

Overall, it seems that $<name> is the "standard" way of dealing with extended 
flags that have a general, not client-specific meaning. So, unless that 
conflicts badly with any other client out there, I would suggest to follow 
that for KMail by using $ToDo, $Forwarded, $Ignored, $Watched.

regards
Volker
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