Just started using KMail for my personal email, but I can't delete messages - the "Move to trash" option is grayed out, as are the "Move Thread to Trash" and "Move message to" options. I have selected the desired trash folder from the advanced settings. I'm using KMail 5.10.0 on Arch Linux

Not sure what the problem was. Deleted the account and set it up again, and once again chose the appropriate trash folder and it works fine now.

I am seeing the same behavior for my IMAP Inbox, used to work fine. I removed the account and added it again, but to no avail. Any hints on what makes these actions deactivated? KMail version is 5.15.1 (20.08.1).

Thank you very much for your help!

One observation: When I enable the Unified Inbox, I can delete / move the message fine, even from the IMAP Inbox. Strange...