Brother HL-760 Series User Manual page 22

The following types of envelopes are not recommended for use.
Damaged, curled, wrinkled, or irregularly shaped envelopes
Extremely shiny or highly textured envelopes
Envelopes with clasps
Envelopes with self-adhesive closures
Envelopes of baggy construction
Envelopes not sharply creased
Embossed envelopes
Envelopes already printed by a laser printer
Envelopes pre-printed on the inside
Envelopes that cannot be arranged uniformly when placed in a pile
Fig. 2-2 Envelopes
Printable Area The figure below shows the physically printable area.
(Except 9"x12" envelope)
Unprintable area
Approximately 4 mm(0.16 inch) for any sizes of paper
Fig. 2-3 Printable Area
CHAPTER 2 PAPER HANDLING
CHAPTER 2 –3