a pneumatic mail delivery system includes a carrier having first and second open ends and corresponding hinged covers for selectably covering the open ends . the system includes first and second carrier terminals each having front openings selectively covered by hinged doors . the terminals may be positioned at a mail deposit location and a residential location . a pneumatic conduit connects the terminals through which the carrier may be guided therebetween . the conduit is connected to a blower for conveying the carrier . spring - biased buttons attached to respective terminals are electrically connected to the blower for actuating the blower upon detecting a closure of a respective door . a photoelectric light sensor is attached to each terminal and is electrically connected to a light source mounted on the front of each terminal . respective lights are energized when a respective light sensor detects mail in the carrier .