On Wed, 08 Feb 2017 07:16:48 -0500 Ruga <r...@protonmail.com> wrote: > It is precisely because I am responsible for other persons that I > make such rules based upon the RFC standard,
No, you don't. You make the rules based on your misreading of RFC 822. RFC 822 permits this header: To: undisclosed recipients:; End of story. Regards, Dianne.
