Why do recipients sometimes see “via” or “On Behalf Of” as part of the FROM address in their email program?

ContentMX Email Deliverability, Knowledge Base

This information appears because we are providing the email authentication needed for the deliverability and security of your email campaigns. How authentication works By default, it is fairly easy to forge your identity when sending email. All you do is set the FROM address and name to whatever name you would like. For instance, anyone can pretend to be a …