When I Become King ... I will introduce the radical concept of "Responding Likewise" which simply means that if I send an email to my Loyal Subjects, they will reply via email. Not by snail mail, fax, or (heaven forbid) telephone.
Naturally, if the matter is URGENT it'll be okay to change the method of communication, but anyone who - by default - replies to an email with a phone call - will be ignored the first time. Then castrated upon the second occurrence. Then executed upon the third occurrence.