Brother MFC 8840D A - Manual (Page 19)

USING THE MACHINE AS A PRINTER 1 - 12
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
■
The machine 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.