In the late 70s when Canada Post workers were in an unsettled state and strikes or threat of strikes was disrupting the industry I was employed in, a solution was proposed.
ICS (insurance courier system) was funded to continue the reliable delivery of mail within the insurance system. At the time the industry was reliant on the timely delivery of paper mail.
ICS was formed 40 years ago and remains a vibrant profitable business to business courier. Most intra company mail is still handled by ICS as it has proved to be efficient and cost effective alternative to the convential mail system.