Set up a new #KMail instance, to manage a specific mailbox, and guess what, trying to send e-mail ends in a grayed-out e-mail composer window and no error message. It just... hangs there. 🤷♀️
It's been 10 years since #Akonadi fscked up #KMail, and the developers *still* cannot get it to a working condition. This is beyond silly.
I am not blaming the current developers. I am blaming whoever made the decision to implement this over-engineered boondoggle that Akonadi is.