I don't think it's possible to do in one click from within an email without invoking some external service.
The best bet would be to make that SEND link point to a web server of your own which could sent the email for you.
eg:
<a href="http://myserver.com/sendmail?to=me@home.com&from=you@home.com&subject=hello&body=something> Send an email </a>
However this would have some security implications, so you'd want to make sure malicious people couldn't just pass arbitrary values in and spam people with your server.
So perhaps using some kind of a token system so each initial email has a unique token, than your web server can lookup and send the right email out.
eg a link like:
<a href="http://myserver.com/sendmail?token=23jfui34jfd934j> Send an email </a>