I just removed images and sent out PMs to 10 people due to them not following the signature restrictions. PLEASE take it upon yourselves to follow the rules. Easy way to check: right click on the image that you're using in your signature, and click "View Image Info" or "Get Info" (or some such depending on your operating system). It will list the information, including the dimensions in pixels. First number is length, second is width. If the first number is greater than 500 and/or the second number is greater than 175, then the image is too large and needs to be resized if you want to continue using it.