Yes! On any email you get that has photos attached, you'll see thumbnail-size versions of the images at the bottom of the message.

Play slideshow
Click any of the thumbnails to open that image in the slideshow viewer (nice, eh?). Then, either click Play to commence the slideshow, or click the arrow buttons below the viewer to see the next or previous photo at your own pace (you can also press the right and left arrows on your keyboard). Finally, clicking on the image itself will open the next one.

Close slideshow
Click in the gray area on either side of the image, or above or below it, or on the X in the slideshow toolbar, to close the slideshow and go back to Mail.

Download photos

• Single image
  Click the link for the photo you want to download (for example, LR_003.jpg). The link appears in two places, and you can click either one: the first is above the message (in the header area), and the second is below the thumbnail version of the image at the end of the message.
• Download All
  Click Download All, either above the message (in the header area) or just above the collection of thumbnail images at the end of the message.
• Download Selected
  Check the boxes below the thumbnail versions of the images you'd like to download, then click Download Selected just above the collection of thumbnail images at the end of the message.