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Re:Ask HN: Is email the new fax? by jlgaddis on Thursday April 26, 2018 @12:52AM (#16928884)
> ... but they would only accept mail or fax.

It's because the USPS (and FedEx, UPS, et al.) and fax are considered "secure" methods of transmission for confidential or private information (including PHI).

E-mail is not, because it travels over the public Internet.

Re:Ask HN: Is email the new fax? by Rjevski on Saturday April 28, 2018 @10:33PM (#16950453)
But technically it’s just as insecure, if not more - email has opportunistic encryption, fax doesn’t.