1. Log in to the administrative console for your domain. To log in, go to http://smallbusiness.yahoo.com, click the Sign in to Small Business button, and enter the Yahoo ID and password for your administration account.  
  2. Select Domain from the toolbar near the top of the page.  
  3. Click Manage Advanced DNS Settings.  
  4. Click Change MX Records.  
  5. Include the following MX record values: cloud5.spamtitan.com ; cloud6.spamtitan.com
  6. Click Submit.