1. Open Outlook Express

2. Click on Tools [on top header]

3. Select Accounts

4. Click on ADD

5. Select Mail

6. Give - Display Name: Your Company Name

7. Email Address: Your Mail address 
   (for ex: info@YourDomainName.Com)

8. Incoming Mail Server: mail.YourDomainName.Com

9. Outgoing Mail Server: mail.YourDomainName.Com

10. Account Name: Your complete Mail address 
    [Example: info@YourDomainName.Com]

11. Password: your mail password

12. Click Finish

13. Again from main screen >> Tools >> Accounts 

14. Select your respective email account

14. On the properties tab, check the option box
    a) Check - "Server require authentication" under server tab
    b) Check - "Leave a copy of the message in the server".