Submitting Web Forms via email and redirection to another web page

I am trying to build a simple form that the action would be mailto:emailaddress then once the person clicks the submit button, they will be directed to a thank you page. 

I have 2 questions:

1.  Every time I create a form with the action being mailto:emailaddress , when I click submit, my email program open and it wants to send an email with none of the information that was filled out on the form. Why does this happen and how do I set it up so that the form contents are emailed to the person who the form is supposed to be emailed to?

2. How do I redirect the person to a thank you page when clicking the submit button while at the same time the information that was filled out on the form goes to the email that is noted in the action?

Thank you in advance for your help.