Printing on EnvelopesYou can stack up to 15 envelopes in the sheet feeder or you can manually feed envelopesone at a time.U.S. Commercial number 10 (COM10) envelopes and European DL envelopes arerecommended. You may be able to stack envelopes of other sizes in the sheet feeder;however, Canon cannot guarantee consistent performance on envelope sizes otherCOM10 and DL.The following envelopes are not recommended because they may cause jams or smears, ormay damage your printer.Envelopes with windows, holes, perforations, cutouts, and double flaps.Envelopes made with special coated paper or deeply embossed paper.Envelopes using peel-off sealing strips.Envelopes in which letters have been enclosed.When you are ready to print on envelopes, follow these steps to stack envelopes in thesheet feeder. ( you can also manually feed envelopes one at a time.)1Make sure thatthe paperthickness leveris set to theright.