this post was submitted on 11 Jun 2023
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No, encryption was considered. It was supported from pretty early on via PGP. If you check out decent mail clients (obligatory digdeeper), you'll find the tooling.
Why didn't it ever become the norm?
Encryption was illegal back in those days, especially for export. Google “crypto wars”.
Furthermore it was quite computationally expensive. Modern CPUs have special instructions to work with AES and other algorithms, but back then it had to be done with individual instructions and with slow clock speeds.
It takes effort to set up a PGP client and the person you're sending it to probably doesn't have PGP set up. It's used for some confidential journalism and whistle blowing stuff, but since everybody just uses webmail anyways, it's not practical to use.
Email with PGP is very far from secure. No forward secrecy (one mistake and the entire thread history is revealed) and metadata is unencrypted.
PGP email has nothing to do with the email protocol. All your message metadata and headers are still not encrypted/can’t be encrypted. You can only encrypt some payload with a PGP key, and it’s up to the receiver to figure out whether or not they want to trust any of the message metadata. The entire envelope is still plaintext everywhere. PGP email is just email, but you’re sending some random encrypted text in it.