I use Rules to restrict users from sending email to group of all employees (Router/SMTP> Restrictions and controls> Rules). My rule is when To or CC is email@example.com don't Accept Message and don't Deliver Message except when sender contains firstname.lastname@example.org.
If someone sends on "email@example.com" <firstname.lastname@example.org> or <email@example.com>, the email is still delivered.
What should be done? Is there other way to block users from replying to the email.
Thanks to help!
Feedback number WEBBAUA9HK created by Gavinash A Parboteeah on 12/22/2017