Brother MFC-J2330DW Online User's Manual page 52

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IMPORTANT
If envelopes are "double-feeding," load one envelope in the paper tray at a time.
If you are using envelopes that are longer than the tray length, such as Com-10 envelopes, extend the tray
as follows, and then load the envelopes.
Rest the tray on a flat surface. Push the green slider to the left and then extend the tray until it locks into
place.
5. Replace the tray top cover.
6. Slowly push the paper tray completely into the machine.
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