Whitfield Diffie (yes, of Diffie-Hellman), just posted to the IP list an email he pulled up from 1976(!) in response to a crappy article about VA Shiva Ayyadura "inventing" email. I'm sure he's got even older emails, but the fact that he had it, was able to easily find it, and then resend it with a descendant of itself 38 years later is pretty amazing to me!
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A quick look at my files finds messages from from 1976 that use that format:
29-SEP-76 1935 FTP:CERF at USC-ISI Data Communication Conference/ Sept 1977
Date: 29 SEP 1976 1802-PDT
From: CERF at USC-ISI
Subject: Data Communication Conference/ Sept 1977
To: walker
cc: cerf, wd at SU-AI
22-AUG-76 0857 FTP:LEFAIVRE at RUTGERS-10 MORE ON THE LISP COMPILER
Date: 22 Aug 1976 (Sunday) 1155-Est
From: LEFAIVRE at RUTGERS-10
Subject: MORE ON THE LISP COMPILER
To: DIFFIE at SU-AI
" A quick look at my files finds messages from from 1976 that use that format:
so I don't see how this can be novel in 1978. "