Brother DCP-8020 - Manual (Page 92)

6 - 15 USING THE DCP AS A PRINTER
6
Press and slide the paper-width guide to fit the envelope size.
7
Send the print data to the DCP.
8
After you finish the print job, close the back output tray.
When you put envelopes in the MP tray, please remember the
following;
■
During printing, the inside tray rises to feed envelopes into
the DCP.
■
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.