Brother MFC-8440 Software User's Manual page 22

6
Press and slide the paper-width guide to fit the envelope size.
When you put envelopes in the MP tray, please remember the
following:
■
During printing, the inside tray rises to feed envelopes into
the machine.
■
The side to be printed on must be face up.
■
Put the leading edge (top of the envelope) in first and push
it gently into the tray.
7
Send the print data to the machine.
8
After you finish the print job, close the back output tray.
1 - 15 USING THE MACHINE AS A PRINTER