Letter Openers < Additional Mailroom Equipment Letter Openers Make quick work of processing incoming mail with these speedy envelope openers. Letter Opener 440 The LO 440 letter opener is the perfect solution for small to mid-size companies. Make quick work of processing mail with this efficient, automatic letter opener. Letter Opener 210 The Series 210 is designed with small and medium mail-opening operations in mind. Ideal for operations processing between 200 and 2000 pieces per day. Letter Opener 306 The 306 offers the speed and features needed in high volume incoming mail centers.