Some tips to help you set up your email for sending and receiving through outlook express:
Use your full email address as your POP3 username (ie. admin@domain.com) Do not log-in using Secure Password Authentication. Your SMTP Server requires authentication to send. If there are any authentication problems, go to Tools > Accounts > Properties > Servers. Then check the box that says " My server requires authentication ", click Settings. Type in your username and password, hit OK, then OK again. Restart Outlook. Again, use your full email address as your login name. Again, no secure password authentication.