How should I load envelopes?

• You can print on plain paper envelopes in this size: No. 10 (4.1 נ9.5 inches [105 נ241 mm]).
  1. Raise the paper support and its extension, pull out the output tray, then raise the paper stopper.
     
  2. Slide the edge guide to the left.
     
  3. Load up to 10 envelopes against the right side. Load them printable side up and flap edge left.
     
  4. Slide the edge guides against the envelopes, but not too tightly.
     
     Always follow these loading guidelines:
     • If you have trouble loading a stack of envelopes, press each envelope flat before loading it or load one envelope at a time.
     • If print quality declines when printing multiple envelopes, try loading one envelope at a time.
     • Do not load envelopes that are curled, folded, or too thin, or that have plastic windows.
  Related references
  Paper Loading Capacity