FWIW, I've just submitted patch for this to the list: https://sourceforge.net/p/gnu-efi/mailman/message/37684742/
Ah, interesting. Another data point: This used to work fine with Enigmail, but I missed the exact point when it became broken. It changed in the past months, maybe 6 months ago most, but there was a distro update from me in that window as well (SUSE 42.2 -> 15.0). Let me know if you need further details about my settings. I originally had OpenPGP enabled for that account as well, just defaulting to S/MIME. And "reply encryptedly" (or how it's called was on then as well. That had no effect any more...
Enigmail affects default encryption policy of s/mime-only accounts
* fixed test loop counter bug
*added wait_sof and delta_t support for the master
* fixed cleanup_module
* RTmac event example added
* added module license