Canon PIXMA MP280 Series Advanced Manual page 42

Select Envelope in Commonly Used Settings on the Quick Setup sheet.
(1)
Select DL Env. or Comm. Env. #10 in the Envelope Size Setting window.
(2)
Select Landscape in Orientation.
(3)
Important
If you do not specify the envelope size or orientation properly, the address will be printed
upside down or will be turned to 90 degrees.
Note
The machine may make operating noise when feeding envelopes.
If the print result is upside down, open the printer driver setup window, select Envelope in
Commonly Used Settings, then select the Rotate 180 degrees check box in Additional
Features.
For details on the printer driver settings, see
Printing Documents .
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