Brother MFC-640CW - Manual (Page 42)

1 - 17 INTRODUCTION
2
Insert the envelopes into the paper tray with the address side
down and the leading edge (top of the envelopes) in first. Slide
the paper side guide to fit the width of the envelopes.
If you have problems when printing on envelopes, try the
following suggestions:
1
Open the envelope flap.
2
Make sure the open flap is either to the side of the envelope or
to the back edge of the envelope when printing.
3
Adjust the size and margin in your application.
To load post cards
1
Raise the paper stop and insert the post cards into the paper
tray. Slide the paper side guide to fit the width of the post cards.