Am Mittwoch, 27. Dezember 2017, 16:09:56 CET schrieb Wolfgang Bauer:
Maybe you're hit by https://bugs.kde.org/show_bug.cgi?id=388160?
Try setting an explicit host name in KMail's sending settings and see if it helps.
Otherwise ksmtp will send the server's hostname, and some servers apparently don't like that... A fix for this has been submitted too (also on Friday), but is not in Tumbleweed yet.
Kind Regards, Wolfgang Hmmm... Today, it suddenly worked! Yay! Only thing I did was deleting the SMTP server accounts and setting them up from scratch, but the software versions are still the same. Sending this mail from Kontact again.
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