I'll say it again and again
Countries need a {SEM} Secure Email, provided by Gov (enables managed monitoring, with suitable legislation) {SEM} would use *one* set of servers that only allow mail to be sent within them
use for all Gov & Business incl eTax, eFinance, eLegal etc & possibly even eVoting (prepol mail)
Gov could provide 3 levels of encryption for use in {SEM} >> {UKSEM} {AUSEM} {USSEM}...
tried & tested SEMs could then exchange mail between them.
(more management principles here.....)
Crims would go elsewhere...
also need eClouds in your OWN Country not someone elses !!! (see ASD's warning on China's Cloud)