He'd have to have bang routes set up on his mail server for that. =) So it's not just effectively dead, it's dead-dead.

I am chose my phrasing for the very reason that it's merely incredibly unlikely and not at all impossible. I've even sent mail with bang-paths post-2000 just to confound the recipient, though it is a rare network that would accommodate that today.

Edit: punctuation.

Where can I still use bang-paths?!

Nowhere that I know of, at least not for certain. The company with the mail server I used has been subsumed by another company, however some other companies from that time may still be running compatible mailers.