Gmail signature not working on mailto

Do this (on desktop of course):

http://mail.google.com/mail/?view=cm&fs=1&tf=1&[email protected]&su=Hello%20Dani%20(via%20Stack%20OverFlow)">http://mail.google.com/mail/?view=cm&fs=1&tf=1&[email protected]&su=Hello%20Dani%20(via%20Stack%20OverFlow)

Note:
If you want your gmail signature, you must use gmail.
If you'd like to use a different client, you must make a signature on that client itself.

Using body as a parameter in the mailto link replaces everything that is already placed into the email by Gmail. If body is not part of the attribute from mailto, then the signature works as expected.

Source: I tested this with your fiddle by removing the body attribute and clicked the link again. It works just as you want.

I have to add code to submit this answer with a fiddle, so here is the link that will work with a signature:

<a href="mailto:[email protected]?subject=Thanks for your time" target="_blank">test</a>