In addition to "Do not allow attachments to be saved or opened that could potentially be a virus" being checked,  "Block images and other external content in HTML email" and "Restricted sites zone (More secure)" are also checked on my Security tab.  Is this what's causing the problem with sending photos?  If so, can I assume that deleting these would be safe considering that I have Norton Security.  Secondly, would it be alright to keep "Do not allow attachments to be saved or opened that could potentially be a virus" and "Show images and external content sent from email addresses in my Safe Senders list?" 

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