Am Mittwoch, 7. Dezember 2016, 15:43:19 schrieb Carlos E. R.:
[...] Well, my opensuse alias is not in the logs, that's whey it passed. So, it is using my ISP "from" in the envelope, but the "from" header is my alias. Not something you can do on the MUA... [...]
In KMail, "Use custom sender address" in the Advanced tab of the SMTP settings dialog looks promising.