Set Up Parental Controls on Your Mac

By Tom Nelson, About.com

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Parental Controls - Mail and iChat

You can limit who the managed account can interact with in Mail and iChat

Parental Controls gives you the ability to limit the use of Apple's Mail and iChat applications to a list of known, approved contacts.

Limit Mail. Place a check mark to prevent the managed user from sending mail to or receiving mail from anyone who isn't on the approved list.
Limit iChat. Place a check mark to prevent the managed user from exchanging messages with any iChat user who isn't on the approved list.
If you placed a check mark next to either of the above items, the approved contact list will be highlighted. Use the plus (+) button to add an individual to the approved list, or the minus (-) button to remove an individual from the list.

To add an entry to the approved list:
1. Click the plus (+) button.
2. Enter the first and last name of the individual.
3. Enter the email address and/or iChat name of the individual.
4. Use the dropdown menu to select the type of address you're entering (Email, AIM, or Jabber).
5. If an individual has multiple accounts that you want to add to the list, click the plus (+) button at the end of the Allowed Accounts field to enter additional accounts.
6. If you would like to include the individual in your personal Address Book, place a check mark next to 'Add person to my Address Book.'
7. Click the ‘Add’ button.
8. Repeat for each additional individual you wish to add.
If you would like to receive a permission request each time the managed user wants to exchange messages with someone who isn't on the list, place a check mark next to 'Send permission requests to' and enter your email address.