Thank you Critmcdonald! That also solved my problem with an link that had a "|" in it.
I noticed that the one "/" is missing.
<html>
This is text. <a href="mailto:
somone@gmail.com?Subject=The Subject&Body=This%20is%20the%20body.">Click here</a> to start your email.
<html>
Should be:
<html>
This is text. <a href="mailto:
somone@gmail.com?Subject=The Subject&Body=This%20is%20the%20body.">Click here</a> to start your email.
</html>