Mailshell Traffic Reputation and Email Filtering Engines  
 
OS X Lion

1. Under the Apple menu, select "System Preferences...".

 

2. Under Internet & Wireless, click on the Network icon.

 

3. Select "Ethernet" from the list and click the "Advanced..." button.

 

4. Select the DNS tab, then click the "+" symbol under "DNS Servers" to add 209.157.66.245 and 74.208.45.33 to DNS servers. Click OK.