On: Gmail: Send mail from another address without "on ...

[sfk]

So you don't want your username exposed. On the other hand, some people do not like to reply to Gmail addresses because they don't want their mail to be scanned by an advertising company.

[delayclose → sfk]

Forwarding email from a random address to a gmail address has been possible as long as gmail has existed. It's not a feature that depends upon Google support.

[sfk → delayclose]

I did not claim that forwarding email is a novelty. I'm against people using it in this very specific case.