Step 1: Choose Tools|Options from the menu bar
Step 2: Go to the second tab named 'Connections'
Step 3: Click on the second radiobutton to mark 'Direct Delivery'
Step 4: The DNS Port should typically be set to 53
Step 5: If you know the details of your DNS Server you can complete the DNS and
DNS IP fields. How do I find out what my DNS Setting are?
Alternatively, you can click the 'Find' button to automatically detect your DNS
Settings How does the auto detection work?
Step 6: Click 'Save'.