Policy Configuration : Configuring Access Rules

Deleting Email Address Objects
Email address objects can be deleted unless they are in use by an App Rules policy.
To delete one or more email address objects, complete the following steps:
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Navigate to the Firewall > Email Address Objects page on the Policies tab.
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To delete a single email address object, click the trash can icon under Configure for it, and then click OK in the confirmation dialog.
If any of the selected objects is currently in use by an App Rules policy, a popup message notifies you that it cannot be deleted. Click OK in the dialog box. If multiple objects were selected for deletion and one of them is in use by a policy, none are deleted when Delete Match Object(s) is clicked.
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In the Modify Task Description and Schedule window, select the Schedule settings for this task and then click Accept.