Lexmark All in One Printer - Manual (Page 97)

97 Clearing Jams
At entry into the envelope feeder Since the envelope feeder feeds envelopes from the bottom of the
stack, the envelope on the bottom is jammed.
1 Slide the attached envelope weight up.
2 Flip the envelope weight over and back toward the printer.
3 Remove the stack of envelopes from the envelope feeder.
4 Pull the jammed envelope straight out toward you.
5 Replace the stack of envelopes in the envelope feeder.
6 Adjust the envelope edge guide if needed.
7 Rotate the envelope weight and lower it to the stack.
N OTE : If you perform the above steps and envelope jams continue
to occur, feeding a single envelope between steps 4 and 5
may correct the problem.