Opening specific email causes Mail to crash

I have set up Microsoft Office Mail on my iPhone 6. The only problem that I cannot get my head round is that it all works fine but I received an email this morning, and when I clicked on it to read it, the screen just went back to the home page. All other emails I have received are fine and can open and be read no problem, but for this one email every time I try to open it the screen continues to go to the home screen.