There are a few things you need to check for if this happens:

• Check to make sure your login and password are correct ( always check the obvious first )
  
• Both your login and password should be in Lower Case
  
• Try settings the login name to your full e-mail address 'user@yourdomain.com'
  
• Double check that the 'My Server Requires Authentication' option is check in your e-mail client.
• Change both your incoming and outgoing mail server address to the IP address sent to you in your welcome e-mail.
  
• Check to see if you have reached your disk quota on the server
• Check to see if you have reached your e-mail quota in cPanel

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