www.unlocktheinbox.com <-- If you send emails you need to read this.

This is a little site I developed to help people configure and set up emails so businesses and organizations can get the best results from sending email.

If you have your own email servers or a domain that you send email from and will like to test the results of your email.  Just read this resource and follow the instructions.

unlocktheinbox.com/resources/emailauthentication/

Everything on the site is free, enjoy.

This would be testing emails on hosted websites only, correct?

It will test any email address....