I use KMail for a while and have some questions.
I use KMail 5.15.2 (20.08.2), IMAP account.

When I delete e-mail (just one message) it moves to trash folder. It's ok But then I would like to undo last action. I press Ctrl+Z and nothing happends. Message is not restored to Inbox folder. Menu item Edit->Undo is also disabled. Why I can not use undo to restore delete email? How to restore deleted message (move message from Trash folder to Inbox but not manually)?