It might be the 21st century, but we're still using squiggles on a piece of paper to agree to all manner of things. If you are emailed a PDF to sign, though, you don't have to faff about printing it, signing it, then scanning it back in: you can actually sign it right in Mail.
Drag a PDF into the email you’re sending, hover over it then at the top right you’ll see a little button appear.
Drag a PDF into the email you’re sending, hover over it then at the top right you’ll see a little button appear.
Click it, and you get a range of Markup options, including one for signing documents. What’s more, you can either add your signature by holding a signed piece of paper up to the webcam on your Mac, and it does a fantastic job of cutting it out of the background or by drawing on your trackpad.