Canada Post Addressing Guidelines
Properly addressing your mail ensures the quickest delivery times and drastically reduces the chance of misdirected mail.
You can use the guidelines at the following link to ensure you are using the most appropriate addressing option for your type of mail.
(www.canadapost-postescanada.ca/cpc/en/support/articles/addressing-guidelines/canadian-addresses.page?)
You can also do your part by ensuring that your reply address is properly written to ensure others write your address properly.