I wonder how hard it will be for spammers to spoof this. Even if in the wrong place those ignorant of where it should go might be fooled.
The Delete Forever button in spam is a total farce. Every time i used it, the same SPAM just keeps showing back up again.
I remember that about 20 years ago some company already came up with this idea to verify email accounts, never understood why it didn't catch on, also can't remember the name of the company. Seems like it's the most logical system to mitigate fake emails often used in BEC scams.