https://github.com/discourse/discourse/commit/c0a8bb9a919ff5a11ed453007723ba671b12977d
This changes the From header of emails from “Jane Doe” to “Jane Doe via <site_name>”. For Meta it will look like “Jane Doe via Discourse Meta”.
It uses the value of the email site title site setting or, if it isn’t set, the title setting as <site_name>.
The format of the From header can be customized with the email_from site text.