On Sat, 15 Oct 2016 15:35:25 +0200
Petr Bena <firstname.lastname@example.org> wrote:
> Believe me, there are people or organizations who would happily
> exchange ability to use mailing lists within some domain for
> guarantee that their emails can't be spoofed in no way (at least
> within their own domain).
You seriously don't understand email security.
Here's a thought experiment: How does your email reader display the
following in the From: column?
From: "Petr Bena <email@example.com>" <unrela...@spammer.org>
and imagine that SPF, DKIM and DMARC for spammer.org all pass just fine.