Brother MFC-8420 - Printing on Envelopes

11 - 12 USING THE MFC 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
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The MFC automatically turns on the Manual Feed mode
when you put paper in the manual feed tray.
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All sides should be properly folded without any wrinkles or
creases.