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Fax machines. Phone lines are pretty private, and sending a fax is usually more secure than emailing something, especially if someone else manages your email.
Counterpoint, fax is not encrypted and wire taps are very easy. At least e-mail can be encrypted so Joe shmoe on the street can't see it.
Besides, all faxing these days is going through VOIP and computers anyways.
Having to physically wire tap the phone line is a lot more difficult and requires local bad actors. Email’s exposure to the internet makes it easier to hack. Yes, email can be encrypted, but if your server is compromised, that doesn’t matter. End to end encryption for email is much harder, and isn’t really used by any institutions (and usually can’t be because of data retention regulations), so the server has complete access to the unencrypted email in almost all cases. Compromising a fax machine that isn’t connected to the internet is a lot harder.
Not all faxes go through VoIP. Your everyday home fax machine probably uses VoIP, because having a landline installed in your home is stupid expensive and unnecessary, but faxes in institutions probably use the PSTN. These institutions most likely need landlines anyway, so having a dedicated fax line makes a lot more sense.
Secure fax is encrypted: it’s sent via https.
Thats just scan to email with extra steps
Also all of german bureaucracy still works only with fax
In my county (midwest America) communication between lawyers and courts is still entirely by fax. I don't know if that's the case of other counties in my state, but it wouldn't surprise me at all.
Parts of Canada as well. Our province is terrible for this.
Japan as well
It somehow suprises me but also not really thinking how traditionalist they are