Insert a line break in mailto body

I would like to insert a line break into my mailto body.I tried %0A, %0D and %0D%0A. Nothing worked for me. I tested on Gmail, Yahoo, Apple Mail, Outlook 2010, Outlook.com and Thunderbird with Google Chrome on Mac OSX.

Any help please ?

Here's my code :

<a href="mailto:email@mycompany.com?subject=Subscribe&body=Lastame%20%3A%0D%0A%20Firstname%20%3A"><img alt="Subscribe" class="center" height="50" src="subscribe.png" style="width: 137px; height: 50px; color: #4da6f7; font-size: 20px; display: block;" width="137"></a>