All of the following settings must be in effect:
Under the General tab:
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Email address: username@yourdomain.com
Under the Servers tab:
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Incoming mail (POP3): yourdomain.com
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Outgoing mail (SMTP): yourdomain.com
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Password: (the password you assigned to your username in your control panel)
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Do not check "Log on using Secure Password Authentication".
Under the Advanced tab:
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Outgoing Mail (SMTP) port: 25
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Incoming Mail (POP3) port: 110
In all of the above, substitute "username" with the mailbox username you set up in your control panel and "yourdomain.com" with the actual domain for which you created the mailbox.