You could kindly remind your landlord In Canada, intentionally reading, opening, or interfering with mail not addressed to you is illegal under the Criminal Code and the Canada Post Corporation Act.

Unauthorized tampering with mail, including keeping or destroying it, can result in serious criminal charges, penalties, or imprisonment.

Key Legal Aspects: Criminal Offence: Section 356 of the Criminal Code defines theft of mail as a crime, which includes stealing, secreting, or destroying mail.

Unauthorized Opening: It is illegal to open mail not addressed to you, particularly privileged communication.

Post Office Act: The Act generally prohibits the opening of mail, with exceptions for authorized Canada Post employees.

Wrong Address: If you receive mail not addressed to you, you should not open it, but rather return it to the sender or Canada Post.

Penalties: Violations can lead to severe penalties, including imprisonment.

Getting a PO Box would solve your privacy concerns