Mail Delivery Tips Mail Delivery Tips Do not send cash in the mail, always use a check or a postal money order. Send valuable letters and packages by registered or certified mail, UPS, Federal Express, DHL and others that provide routine tracking methods and insurance for their shipments. Inquire about purchasing insurance for protection against loss or damage when shipping valuables. If you must mail medications, please send by registered, certified mail, UPS, Federal Express or Express. Time sensitive material should be sent by guaranteed overnight shipping that provide tracking. Mailboxes are only for students that reside on campus. Remember to bring your student ID when you claim packages.