Brother HL-5050 - Manual (Page 46)

ABOUT THIS PRINTER 1 - 29
Printing on envelopes from the MP tray (For HL-5050 and HL-5070N)
The printer has a straight paper path from the MP tray to the back of the printer. Use this paper feed and
output method when you want to print envelopes.
1
Select the Paper Size, Media Type, Paper Source, and other settings in the printer driver.
Media Type: Envelopes
Paper Source: MP Tray
PCL driver
PS driver
The printer automatically turns on the MP Tray mode when you put paper in the MP tray.