(5) A written communication addressed to an applicant or a registered proprietor or registered user at an address given by him or her, or treated by the registrar, as his or her address for service shall be deemed to be properly addressed. (6) Where, at any time, the registrar doubts the continued availability of an address for service entered in the register, the registrar shall request the person for whom it is entered, by letter addressed to his or her trade or business address in the register to confirm the address for service. (7) If within three months after making the request under sub regulation (6) the registrar receives no confirmation of the address, the registrar shall strike the application off the register. 10. Agents. (1) Except as otherwise required by these Regulations— (a) an application, request or notice which is required or permitted by the Act or these Regulations to be made or given to the registrar or the court; (b) all other communications between an applicant or a person making the request or giving the notice and the registrar, or the court; (c) all communications between the registered proprietor or a registered user of a trademark and the registrar or the court or any other persons, may be signed, made or given by or through an agent. (2) An applicant, a person making a request or giving a notice, a proprietor, or registered user may appoint an agent to act for him or her in any proceeding or matter before or affecting the registrar or the court under the Act and these Regulations by signing and sending to the registrar or the court as the case may be an authority to that effect in Form TM 1 or in such other written form as the registrar or the court may consider sufficient. 1996