Brother DCP-8020 - Manual (Page 88)

6 - 11 USING THE DCP AS A PRINTER
Printing on envelopes
To print on envelopes use manual feed tray or multi-purpose tray.
1
Select the Paper Size, Media Type, Paper Source, and other
settings in the printer driver.
Media Type: Envelope, Env.thin or Env.thick
For DCP-8020:
2
Open the back output tray.
■
The DCP automatically turns on the Manual Feed mode
when you put paper in the manual feed tray.
■
All sides should be properly folded without any wrinkles or
creases.