One of my great stories from the early internet days was I received an email from another
site that had a from line of:
From: Hi There! Will Martin of AMSAA Here <will(a)amsaa.mil>
I responded by setting mine to:
From: Hi There! Ron Natalie of BRL Here <ron(a)brl.mil>
Of course, I promptly forgot about it. Amusingly it got written up in a HUMAN-NETS
discussion of signature lines but it also croaked a few people who had imperfect RFC822
vs. UUCP handlers because of the !.