Given this requirement, free accounts will probably not be possible. If a person uses a free email account for critical transactions, what can one say? There’s a bigger issue here regarding our increasingly digital lives that needs more comprehensive change than regulation of some areas.

Paper mail delivery is guaranteed in most of the industrialized world, more or less. Email is increasingly used as an alternative but is entirely the recipients’ responsibility. Receiving paper mail costs nothing, that’s probably why so many people choose a free provider like Google.

Also, how would you solve the issue of identity verification in case a user loses means of access?