Email Help!

I am getting error: The SMTP host was not specified. Is host the server name? What should go in the smtp from??
My server name is: CMSEXCL04.cms.k12.nc.us
I think my smtp name is: smtp.emailmyname.com
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On my web.config page i have code:
  <configuration>
    <!-- Add the email settings to the <system.net> element -->
    <system.net>
      <mailSettings>
        <smtp from="smtp.emailmyname.com">
          <network
               host="CMSEXCL04.cms.k12.nc.us" port="25" userName="username" password="password" defaultCredentials="true" />
        </ ...