Are you using Basic webmail or enhanced?
Allow or Block Images You Receive in Email
To allow images to display in messages you receive, or do disallow them, follow the steps below.
From the WebMail Inbox, click Preferences.
Click General Email Preferences.
Click the checkbox next to HTML Privacy Protection.
Click Save.
To unblock, uncheck the box.
http://ww2.cox.com/residential/support/internet/article.cox?articleId=498e2b40-637d-11df-ccef-000000000000