As a user of many of these prior to 1980 i find the quirk of saying they are "non internet" amusing. They aren't all rfc822 conforming as defined. They absolutely did exist and continue to exist inside things like sendmail.cf and uucp over ip was a thing, as was decnet mail. Very few people who used or communicated with BITNET via Unix cared it "wasn't internet" because the whole point in email was to be transport neutral.
I think this is a fish/bicycle comparison uplifted into wiki. John Quartermain would have said this was a misunderstanding, even back then doing "the matrix"
X400 names exist in active directory, ldap and x509 certificates. Every time you connect to a tls protected Web page, the other fields of the certificate encode an x400 distinguished name, which is ignored, using the SNI info
I think this is a fish/bicycle comparison uplifted into wiki. John Quartermain would have said this was a misunderstanding, even back then doing "the matrix"
X400 names exist in active directory, ldap and x509 certificates. Every time you connect to a tls protected Web page, the other fields of the certificate encode an x400 distinguished name, which is ignored, using the SNI info