5.0.1 email image cache problems

I have two different email accounts that I check on my iPhone 4 with the 5.0.1 update. One is a Google account. The other is a private account. I receive images from a remote security system at a warehouse I monitor when motion is triggered. The device sends 3 images to both accounts. When I open my email on my Mac laptop or desktop, I can see the current images just fine, but whenI view them on my iPhone, it sends what appears to be an old cached version of the image on both accounts. If I compare the emails on the computer, timestamps, image numbers, etc., it is obvious that my desktop and laptop are working correctly, but the iPhone email accounts are not displaying the images correctly. When I view on the iPhone with the new update, I get a reating old image no matter how many times the alarm is triggered. It is like the image was an old cache version from days ago set on a loop that it cannot get past. I experienced NO problems prior to the update. Any suggestions on how to clear the cache on iPhone email if there is such a thing?