When you send a form using the mailto: command, the data gets sent using the post method and in the process gets reformatted. When you receive the form data in your email it will contain hexadecimal characters, spaces will be replaced with + signs, and each value will be separated by an & sign.
Option 1: REFORMAT AFTER
Create your form using the following syntax:
<form name="NameOfYourForm" method="post" action="mailto:firstname.lastname@example.org">
<!-- your input tags go here -->
<input type="submit" value="Send">
Then download the attachment to this post. Open the file in your web browser. When you receive the email containing the form data, just select it all and copy it. Then paste the data into the "hexadecimal value" box. Click decode to convert it to ascii. Then click split to remove +'s and to split data onto multiple lines. Use the "add html" checkbox to make the output viewable in your web browser.
The first input tag that you use in your form will become the <title> if you use the html option. So if your first input tag is name="Name" value="Joe Smith" then the html title will appear as <title>Name: Joe Smith</title>.