From Longman Dictionary of Contemporary Englishexpress mailexˈpress ˌmail noun [uncountable] American English TCMa post service that delivers letters and packages very quickly
Examples from the Corpus
express mail• A friend on the Examiner staff sent a supply of Combat by express mail.• There are three principal product areas: letters, express mail and parcels.• The thing will make phone calls, fax, send E-mail, post or express mail, address envelops and post reminders.• Editing was done via express mail. 