(1) Where a summons is delivered or sent to any person for service under rule 24, rule 27 or rule 28, such person shall be bound to serve it if possible, and to return it under his signature, with the written acknowledgment of the defendant, and such signature shall be deemed to be evidence of service.

(2) Where from any cause service is impossible, the summons shall be returned to the Court with a full statement of such cause and of the steps taken to procure service, and such statement shall be deemed to be evidence of non-service.