I am seeing increased number of calls from via ggpht.com GoogleImageProxy agent for some of the URL fetches. Details: I have put in an image in the email html body. When I open the email, I expect a call to be made to my server to fetch this image. However, since Gmail uses its proxy server, I see multiple calls made at regular intervals (about ~500 calls per image. In one instance I have logs for 5000 calls for one image as well).
Any idea why the same image is fetched so many times?
This is an old question but because this is served by Google search: GoogleImagProxy anonymizes Gmail openings. So, if you use a newletter or auto-responder and somebody opens an email containing an image, usear-agent shows as GoogleImageProxy.