Longman Dictionary of Contemporary English
recorded delivery
noun
EXAMPLES FROM CORPUS
▪ Certificates have for some time been sent in postal tubes by recorded delivery to Divisional Secretaries.
▪ General Accident may cancel this policy by sending seven days notice by recorded delivery to your last known address.
▪ We suggested recorded delivery for your own protection.
▪ Witness summonses can be served by post, preferably by recorded delivery.