double email field for confirmation

Hello,

some people fill the email field wrong and I miss a chance to get back to them.

I’m trying to create another email field to guarantee that the user fills it correctly. The problem I have is after making a new field in the form, to validate it. The form is only validating if the filled field is a email and not if it is equal to the other email field. Can someone help me?

http://wordpress.org/extend/plugins/easy-contact-forms/