On Sun, 24 May 2020, Michael wrote:

>I get that same pop-up.  But I get it for basically everyone using
>signed mail, not just Uwe.  It is annoying.  I always just click
>cancel, but would be interested in some sort of "just don't check"
>checkbox.

Maybe `ps -ux` from a console after it pops up will lead you to the
culprit.  Too, maybe `tree` could help.

Jonesy