Canon BJC-620 - Manual (Page 45)

Check your software to see if it prints envelopes in portrait or landscape
orientation. It's a good idea to print on a sheet of paper before printing on an
envelope to check the orientation.
Printing on envelopes in portrait orientation results in faster printing. However,
several software packages, such as WordPerfect® and Word for Windows,
default to landscape orientation. This requires adjustments in the software to
correctly print on envelopes with this printer. See your software documentation
for details.
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When you are ready to print on envelopes, follow these steps to stack envelopes
in the sheet feeder. (You can also manually feed envelopes one at a time.)
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Chapter 3