Offline reading of Apple Mail

I am running OS X Yosemite with Apple Mail 8.5. I have my Google account set up as a POP account. Whenever I disconnect from the internet and open Apple Mail, all of my images in my emails have the blue box with a check mark in it. Is there anyway that I can have it so that when I am disconnected from the internet I can read and see all of my images in my emails?