Are there are any demos/examples of USING masks?

Detailed description:

There don’t seem to be any working examples of putting masks to use anywhere to be found. I’ve not been having much success in my first day of trying to use them. A popular mail program (Gmail, Outlook 365 on the web) doesn’t let you modify the from address, and a mail program that DOES let you change the from address reports that the mask is an illegal email address. I was able to send an email from a web form, but the receiving mail server rejected it for the mask address being illegal. Can anyone show me step by step how you send an email with a masked from address from Gmail or Office 365, what the recipient receives, and what the originator receives as a reply?

Product & version number:
Norton Antitrack – no version number where it should be
Serial Number: J8XR64F2F6VP

OS details:
Windows 11 Pro
Version 23H2

What is the error message you are seeing?

If you have any supporting screenshots, please add them: