From Longman Dictionary of Contemporary Englishexpress post/mailexpress post/mailTCMa system that delivers letters and packages very quickly → express
Examples from the Corpus
express post/mail• A friend on the Examiner staff sent a supply of Combat by express mail.• Competition has forced drastic improvements in some areas, such as express mail.• Editing was done via express mail.• The thing will make phone calls, fax, send E-mail, post or express mail, address envelops and post reminders.• There are three principal product areas: letters, express mail and parcels. 