Lexmark All in One Printer - Manual (Page 34)

34 Choosing Print Materials
To minimize jams, do not use envelopes that:
• Have excessive curl or twist
• Are stuck together
• Are damaged in any way
• Contain windows, holes, perforations, cutouts, or embossing
• Use metal clasps, string ties, or metal folding bars
• Have an interlocking design
• Have postage stamps attached
• Have any exposed adhesive when the flap is in the sealed or
closed position
• Have nicked edges or bent corners
• Have rough, cockle, or laid finishes