Overnite Express now delivers to Mexico. Overnite Express can now deliver your papers to Mexico within 2 business days. The charge is a flat rate of $17.95 for “all-you-can-stuff” into an Overnite Express Letter or Legal-sized cardboard envelope. That is half the cost of the other guys! We’re working with Mexico’s most trusted shipper, Estafeta, so you can be sure it’s reliable. This service is only available through ShipOnline. For more information, call your Account Executive at 800 683-7648 (OVERNITE) or by e-mail.