When Manually Receive Emails Initiated: Not Retrieve The Email.

I have 2 user accounts on my pc, both running WinMail with identical options set on both. They are set to check for emails every 5 minutes and at startup. One works fine on both options. The other will not automatically retrieve emails every 5 minutes. It does retrieve when it is started or when manually receive emails is initiated. Every 5 minutes, I hear the tone that is set, but it will not retrieve the email.