Created attachment 148768 [details] No setting for self signed cert like by imap Can't send Emails with self signed certificate. There is not setting for it. Get's a message Failed to transport message. The certificate is self-signed, and untrusted
Can confirm this. At least Thunderbird allows accepting this use case.
A possibly relevant merge request was started @ https://invent.kde.org/pim/ksmtp/-/merge_requests/16