[Kolab-devel] Non-standard IMAP flags in KMail

[Volker Krause]

Hi,

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

- Outlook 2007 is claimed to support only one flag for IMAP items, no idea if 
this is correct (I don't have it here to test it myself), but it would mean 
there is no support for custom IMAP flags. Can anyone confirm this?
- Thunderbird uses $labelN
- 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

-- 
Volker Krause -- volker at kdab.net, vkrause at kde.org
Klarälvdalens Datakonsult AB, Platform-independent software solutions
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