[Dovecot] Message flags

[Michael M Slusarz]

Quoting Ralf Hildebrandt <Ralf.Hildebrandt at charite.de>:

> How do I set message flags in sieve rules in such a way that e.g.
> Thunderbird is displaying the mail as "important"? Is there a list of
> hwo flags are interpreted by different IMAP clients?

There is no standard/defined "important" IMAP flag/keyword.   
Thunderbird is most likely using the X-Priority pseudo-standard header  
in the message itself (which makes sense: it is the sender's intention  
of the message's importance which should be displayed, not the  
receiver's.  Objections to this reasoning by some is likely the reason  
the header has never been standardized).

michael