Directory Search (Mac) - Configuring Apple Mail for White Pages

1. Press Command + Space bar to open Spotlight search.
2. Enter Directory Utility and press Return.
3. Click on the lock icon in the lower left corner. 
4. Enter an administrator's username and password or use Touch ID, then click Modify Configuration.
5. Select LDAPv3, then click the edit button above the lock icon.
6. Click New.
7. In the New LDAP Connection window, enter the server address.
   • Server:  ldap.services.wisc.edu
   • Note: verify the following options are deselected. Do not uncheck 'Use for contacts'.
     • Encrypt using SSL
     • Use for authentication
8. Click Continue.
9. Select the new LDAP server, then click Edit.
10. In the Connection menu, enable custom port.
    • Port: 389
11. In the Configuration Name field, enter the directory name.
    • Name: Directory Search 
12. Click Search & Mappings.
13. Select the 'Access this LDAPv3 server using' drop down and choose Open Directory.
14. Enter the search base.
    • Search Base: dc=wisc,dc=edu
15. Click OK.
16. The following elements do not need to be altered:
    • Leave the checkbox next to Use SSL empty—do not check it.
    • Leave the User name and Password textboxes empty—do not enter any information for these elements.
    • Leave Use for Contacts enabled.
17. Click OK again and enter an administrator's username and password or use Touch ID to finalize changes.
18. Close the Directory Utility app. You should now be able to search for contacts from White Pages in the Apple Mail app.

For more information, see Apple's documentation on configuring LDAP directory access on Mac.