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The Brother MX-4000 4-Bin Mailbox / Sorter / Stacker option helps increase control over your Brother printer’s output.
When printing large documents, use the bins to increase your machine’s output tray capacity.
When the output tray is full, the machine automatically delivers the pages into the mailbox bins.
Removing bins 2 and 4, increases the machine’s maximum output capacity to 1,050 sheets (including the standard output tray).
When printing multiple copies, set the printer driver to deliver each copy into a different bin for higher efficiency.