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.
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.
