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by upofadown 60 days ago
>Encryption would have been baked in from the start, rather than waiting for PGP, S/MIME, and TLS to add them later.

This comment intrigued me so I did a tiny bit of research. It appears that X.400 uses S/MIME for encryption (see RFC-3854). Alternatively something called STANAG 4406 which provides some sort of centralized control of who sees what for military applications.

Neither seems to be "baked in from the start".