By Conner Carey
Signing a contract via email used to entail a printer, pen, and scanner. But now you can do the whole thing right on your iPhone in the Mail app. Once you’ve perfected your on-screen signature, you can continue to use the same one and even change what color it is. To do this, we’ll use the Markup feature that was introduced with iOS 9. Here’s how to sign a PDF document in the Mail app.