Wirelessly posted (htc Pocket PC: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 8.12; MSIEMobile6.0) Sprint T7380)
Seriously though, check your settings at your email server and make sure it is set to download pictures. You could have some sort of Security setting enabled. Then re-check your device settings. You could always delete the account on your device and then re-create it and try re-downloading the email(s).
Good Luck!