One thing that you've really got to love about Apple's new OS X Yosemite operating system for its Mac machines is the new and improved Mail application, which comes with new features such as Mail Markup and MailDrop. In this guide, we'll show you how to use both and what they're good for.

First up, we'll talk about the new Mail Markup feature. This feature allows you to annotate photographs before you send them in an e-mail using the Mail application in OS X Yosemite. Once you attach a photograph to your e-mail, you will be able to scribble all over it with a free-hand pen, with text, with shapes, and much more editing tools.

To begin, start composing an e-mail and attach a photograph to the e-mail. When you hover your mouse over the photograph, you'll see a new white downwards-facing arrow button:

Clicking on it will reveal a drop-down menu where you can click on the new Markup feature:

When you click on Markup, you will be brought to a photograph-editing interface where you can add text, shapes, signatures, borders, lines, and even doodles to the photograph using the various editing tools:

You can choose the colors of any of the text or drawing tools that you use. You can also re-size anything that you add to a photography by clicking on what you've added and then dragging on the blue bounding circles surrounding the element, as you can see around the bottom of the exclamation point below:

When finished, click on the "Done" button and your amendments will be added to the photograph before you send it off to the recipient:

As far as MailDrop is concerned, there's very little user interface to interface with. This feature basically makes it so that when you send an extremely large file via e-mail (larger than your e-mail provider may allow), the Mail application will upload the file to your iCloud account instead and the recipient will receive a link to the file instead of directly sending the file itself to them.

You can watch our complete video walk-through on how to use Mail Markup and MailDrop in OS X Yosemite 10.10 in the video below:

Don't forget to also check out our OS X Yosemite guides on how to enable dark mode for the dock and Menu Bar and how to capture your iOS 8 device's display in video using the QuickTime Player application and a USB connection!