Lexmark MX6500e 6500e Quick Reference Manual page 10

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If you are loading envelopes, then make sure that the flap side
is facing up and the envelopes are on the left side of the tray.
•
Make sure the paper is below the solid line, which is the
maximum paper fill indicator.
Warning—Potential Damage: Overfilling the tray can cause
paper jams.
10
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When using card stock, labels, or other types of specialty media,
make sure the paper is below the dashed line, which is the
alternate paper fill indicator.
6
For custom‑ or Universal‑size paper, adjust the paper guides to
lightly touch the sides of the stack, and then lock the length guide.