For whatever reason, faxes are considered legal paperwork while email is not... even if the fax was sent over IP anyway.
It has nothing to do with whether something is considered "legal paperwork" or not. An email can form a written contract (or be a written communication) as assuredly as a couriered piece of paper or a facsimile.
Fax machines provide delivery confirmation (your fax machine reports whether the entire facsimile was received by the machine at the telephone number that it dialed). You know where it went, and you know that the entire thing got there.
Email, at least historically, hit the Pachinko machine of SMTP relay servers. You knew where it was supposed to go, but you had no idea whether it got there (Do you send read receipts every time someone requests one? REALLY?). These days, it's less Pachinko machine and more Pin the Tail on the Donkey. You know where it's supposed to go, but you have no idea whether it got eaten by the external spam service, the firewall, the internal spam filter, the email client spam filter, or Uncle Horace's all purpose AI email sorter.
The courts have (almost all) converted to electronic filing and docket systems, so no, there's no electronic exception what's considered legal paperwork. If you want to serve someone with a pleading or motion in a case, you can even do it by email, if they've agreed to accept service by email (and thus agreed to be responsible for any screw up in the external spam service, the firewall, the internal spam filter, the email client spam filter, or Uncle Horace's all purpose AI email sorter).
It's all about achieving a level of assurance that "they got it."