Email not Sent from Production site (worked at test)

I installed Contact 7 on my test site, which has the same URL as my main site except for the folder on the end, like so: production_site_URL/test_site_folder

The contact form on my test site works fine. The contact form on my production site does not work. I never get an email from the production contact form. The mail does not go to my spam folder or a junk folder. Suggestions?