In-reply-to » another one would be to allow changing public keys over time (as it may be a good practice [0]). A syntax like the following could help to know what public key you used to encrypt the message, and which private key the client should use to decrypt it:

@eapl.me@eapl.me@eapl.me@eapl.me Agree with the base64 encoding ๐Ÿ‘Œ

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