Gnome Evolution - how to hide "X-Mailer: Evolution ..." from header?

English Applications
#1

I can’t find any setting to hide “X-Mailer: Evolution 3.20.5” from mail header. Is that possible? I don’t insist to inform each receiver about what software I use.

#2

Is standard.
If you don’t want to display a mail app header, then send from a terminal command line.

TSU

#3

Does that mean that Thunderbird having a setting to hide the X-Mailer is not up to standard?