Oce im4530 Operator's Manual page 85

Setting up mailbox for confidential and bulletin board communication
How to create a confidential mailbox or bulletin box mailbox on sender's side is explained here.
1
Press the [FAX] button on the control panel.
2
Press the [ADVANCED] button to enter the advanced menu, and then
press the [ITU MAILBOX] button.
3
Press the [CONFIDENTIAL] (or [BULLETIN BD.]) button, and then
press the [BOX SETUP] button.
4
Press the [ENTER] button.
5
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