One box to server them all - To stop phishing attacks
To stop phishing attacks or to severely limit them, Limit eMail to only one server set (SEM){Secure email server} in every country, everybody uses it for business, work, banking, tax, gov, business.
The principle is everybody is known to that email system, anything malicious here and it can be traced and followed. All email can be verified from a known source. A plain text email with an attachment for communication, no images links (these , such as logo's and diagrams could be in an attachment i.e. pdf, other links would not be used.
Once SEMs have been established they can be joined to other approved SEMs {secure email servers} in other countries. allowing secure international business, trade and politics etc.
So all people only use one server system for important email. If a user wanted other email fro chat rooms or forums etc they could use Google/Yahoo/Bing etc but could not send to the SEM from them.
Using a SEM system would still allow a user to email their family or friends using the system, and would infer a more trustworthy source, as long as it was managed properly.