Canon 3301B002 On-Screen Manual page 118

Loading Paper in the Rear Tray
3.
Specify the settings in the printer driver.
Select Envelope in Commonly Used Settings (or Media Type).
(1)
Select the size for envelopes.
(2)
Select DL Env. or Comm. Env. #10 in the Envelope Size Setting window.
Select DL Envelope or #10 Envelope in Paper Size.
Select Landscape in Orientation.
(3)
Important
If you do not specify Envelope Size Setting (or Printer Paper Size/Paper Size) or Orientation
properly, the address will be printed upside down or will be turned to 90 degrees.
Note
In Windows, if the print result is upside down, select Rotate 180 degrees in Additional
Features with the printer driver.
For details on the printer driver settings, see
Documents (Macintosh)
Printing Documents (Windows)
.
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