Emails are actually not that good at privacy, e.g., hiding IP address. Traditionally clients insert your prv IP address in the email header. Luckily email providers strip them down, mostly, but that depends on the email provider.

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Yeah, I was thinking that the client could be an e-mail client, just like it's now an HTTP client. Or both.

And email is store-and-forward with (at least IMAP) a focus on longlasting archives where at least all metadata is plaintext in any case. 🙈