Advanced settings - Restrict outbound to verified recipients
The Advanced setting for the Address book—which restricts outbound faxes to verified recipients—can be configured at the tenant level by the Tenant administrator under the Advanced Settings tab.
The Tenant administrator can toggle on the Address book setting to:
1) Restrict users to only sending faxes to recipients saved in the address book.
2) Limit who can add address book contacts to the Address book administrator.The Tenant administrator must assign an Address book administrator to manage the tenant address book.
Only the Address book administrator can add and delete address book contacts.
Restrict outbound faxes to address book contacts

Click the Settings icon on the main Enterprise Fax Portal page.
→ The User management window opens.

2. Click the Advanced settings tab in the left margin.
→ The Advanced settings window opens.
→ The toggle switch is accessible that restricts outbound faxes to verified recipients so that faxes can be sent only to contacts saved in the address book.

Toggle on/Flip the switch to the right for the Address book setting.
→ The toggle switch flips from the left to the right and changes to the color purple.

To go back to your faxbox list:
Click the Enterprise Fax Portal tab at the top left in the menu ribbon.
→ Your list of available faxboxes is displayed.