Adding headers via filters

[Ingo Klöcker]

On Montag, 16. September 2019 10:21:15 CEST René J.V. Bertin wrote:
> Hi,
> 
> I have a couple of filters that add a header line to treated messages. That
> doesn't work reliably, I have a vague impression that KMail has to be idle
> otherwise for this feature to work (= applying the filter manually and
> waiting for it to complete). It could also have to to with the header
> caching in the akonadi db.
> 
> I observe this with 4.13 and 4.14, has this improved in more recent
> releases?

I don't think so. I have a manual filter which removes the "SPAM" indicator 
from the Subject header of messages I don't consider SPAM. Another manual 
filter removes certain headers. Unfortunately, KMail doesn't take notice of 
those changes, e.g. it still shows "SPAM" in the Subject.

I'm pretty sure that it's caused by caching or, more precisely, by missing 
cache invalidation.

Regards,
Ingo
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