Contact Form will not accept email address

I recently found out that the contact form on our website is not working.  When testing it is not accepting any email address at all.  How do I fix this?  It worked when I set up this site but for some reason is no longer working.

 

I noticed in the contact form section that one of the fields on the list is grayed out so no sure if this is the issue or not.  All other fields show correctly.