# Configure Mailbox Passcode Parameters by FCOS

You can modify FCOS settings to control how mailbox owners can set their passcodes, including:

- Allow mailbox owners to change their passcodes

- Prevent the use of trivial passcodes

- Lock the owner out of the mailbox when there are too many invalid passcode entries.

To configure passcode parameters:

1. Customize an FCOS to include feature bit 70 (User Options Menu) and the following bits as applicable:

   - 73 (enter and change mailbox passcode)

   - 81 (only require one correct passcode for login)

   - 93 (deny change of passcode in first tutorial)

   - 130 (passcode cannot be same as mailbox)

   - 132 (bad passcode lockout if over limit)

   - 201 (deny trivial passcode)

   - 218 (passcode not needed on direct calls)

2. Assign the FCOS containing these bits to each mailbox that requires these passcode settings.

- Assign an FCOS to a Mailbox