OS X :: Create Clickable Email Hyperlink

In windoze I can type, for example person@server.com?subject=Fish&body=Cod and when I send the email with that in, the person I send it to can just click the link and it will: create a new email put the person it goes to in the 'to' field put the subject in the subject field put the word 'cod' into the body However, when I do this in snow leopard, I just get an unclickable line of stuff, much as you have probably viewed above. Also, when someone sends me an email with a similar link, it's also not clickable and I have to laboriously create a new email with all the fields remembered and filled and gone back to and well you get the picture. How do I make it clickable? It's not the same as a clickable URL, I've discovered, so that didn't work.