Adding headers via filters

[René J.V. Bertin]

On Monday September 16 2019 22:07:12 Ingo Klöcker wrote:

Heh, in my case this is related to spam too, spam reporting to be more precise.

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

That would be my guess too. And I assume that the new headers aren't synced to the actual IMAP folder either (if that's where the message lives in, whether remotely  or locally)? I never saw any evidence of it, anyway. Which you could see as a bug in itself: if the message resides in some server space, any changes you make to it should by synced to the server (if that's what the interface suggests).

The funny thing is that sometimes I see messages resume a non-read status when I apply the filter manually (which I only do after the message shows up as "read"). I have never looked if those are the messages where the header changes worked OK.