Canada Post's main revenue comes from mail and related transactions. In the last 10 years, it has dropped by 33%. In the last five years, the drop has been 20%. If you look at the rate at which the number is increasing, it explains the lack of growth. Mail is Canada Post's main source of revenue. Admail is not significant. It uses a lot of the employees, but it brings in very little.
On September 20th, 2016. See this statement in context.