Italy's "PEC"[1] (Posta Elettronica Certificata, or Certified Electronic Mail) comes pretty close.
There's even an RFC[2] for it.
In order to get one, an individual has to prove their identity via a government-issued ID (ID card or passport), and that email address can henceforth be used to send emails for all official correspondence as if it were certified/verified mail, with the added bonus that both parties "know" the identity of the other party (i.e. the company knows it was very likely me who sent it, as they trust that the people in charge of having verified my ID did their job) and with the added bonus of the _contents_ of the email also being certified to have been sent from that recipient to that destination address, and not to have been tampered with (great thing to have for lawsuit reasons), unlike "standard" registered mail, who only certified that a letter has been sent and picked up.
Estonia's ASICe containers have solved signing any electronic files/documents. Italy is reinventing the wheel a bit. ASICe as such is actually an official EU standard since 2016 and EU law¹ enforces that such digital signatures have to be accepted in every EU member state. Estonian digital signatures have used another standards before though, first Estonian digital signature was given in 2002.
The ID-card also provides S/MIME should someone want to use it but people usually just use ASICe.
Denmark has a similar service called eBoks, but it's a proprietary SaaS product rather than an open standard. What's the user experience like with the Italian system? Does every company support it?
There's even an RFC[2] for it.
In order to get one, an individual has to prove their identity via a government-issued ID (ID card or passport), and that email address can henceforth be used to send emails for all official correspondence as if it were certified/verified mail, with the added bonus that both parties "know" the identity of the other party (i.e. the company knows it was very likely me who sent it, as they trust that the people in charge of having verified my ID did their job) and with the added bonus of the _contents_ of the email also being certified to have been sent from that recipient to that destination address, and not to have been tampered with (great thing to have for lawsuit reasons), unlike "standard" registered mail, who only certified that a letter has been sent and picked up.
[1]: https://en.wikipedia.org/wiki/Certified_email#Italy [2]: https://tools.ietf.org/html/rfc6109