On Sun, May 17, 2020 at 10:21 PM, Jim Avera wrote:
(That being said, always putting "via Groups.io" in the From username sounds like a good idea.)
"via Groups.io" is added when the headers have to be rewritten due to DMARC requirements so it signifies that something specific has happened not just as an eye-catcher.
Referring back to your first message:
If your members are doing something 'wrong' out of habit, isn't a bit of education required?