html button to send email

Question

How do I send an email with specified initial values for the headers subject and message from a button in html, such as this

Answer 1

I couldn't ever find an answer that really satisfied the original question, so I put together a simple free service (PostMail) that allows you to make a standard HTTP POST request to send an email. When you sign up, it provides you with code that you can copy & paste into your website. In this case, you can simply use a form post:

HTML:

Again, in full disclosure, I created this service because I could not find a suitable answer.