Publish draft post via href link

Hello!
Im using gravity forms to let visitors post stuff on my site, and as they do I receive a notification mail telling me that there is a post waiting for my approval. I was wondering if there was a way to put a usual link in the notification mail to approve (and publish) the post without logging on to wordpress. Maybe something like this:

<a href="www.mysite.com/wp-admin/post.php?post=540&action=publish">Publish</a>

Thank you!