once in awhile I get mail from a past owner at my place. I usually mark it as 'return to sender'. Also that the person 'moved' on the mail & place it back in my mailbox. I noticed the mail person threw it out in the trash near the mail boxes. Does canada post return those marked letters back to the sender? or is it pointless for me to do so? Just curious since I don't want more mail again in the future that needs returning...thanks:)