dep via tde-users wrote:
All of this us over ProtonVPN as well.
The VPN has nothing to do with it.
So I'm trying to find out what Thunderbird does that KMail doesn't, or what KMail does that Thunderbird doesn't, and how I can set up KMail so that its behavior emulates that of Thunderbird.
I guess you have problem with the indices on KMail side - probably because you are using the IMAP client on the phone and on the KMail. I suggest repairing the indices in KMail and then use only one client and see if the issue reoccurs. This could be still an issue in KMail for some reason.
It is just a guess
the directories are here .trinity/share/apps/kmail/imap/
I am not sure if you can delete the subfolder and they would be recreated.
I tried once ProtonMail, but it could not convince me that it would be more secure. I de/encrypt the mails locally.
BR