Rodney,
Emails are not being sent? Are there any errors?
Or the plugin says that email was sent, but you never receive it?
1. Make sure that you have configured the plugin itself.
2. Make sure that email you have specified within the plugin is correct and is working.
3. Are you using SMTP?
4. Is CRON working on your site?
5. Only emails sent through "Contact Us" plugin are not coming?