I'm having trouble viewing images in emails!  OR  I'm having trouble forwarding messages with images included!
 
Click Preferences

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Click on the Mail tab.

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In the Displaying Messages section, find the line that says Display Mail and select the As HTML (when possible) option.

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Check the box labeled Download pictures automatically in HTML Email.

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Click the Save button at the top.

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Click Preferences again.

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Click on the Composing tab.

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In the Composing Messages section, find the line that says Compose: and select the As HTML option.

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Click the Save button at the top.

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Please be aware, by default in Internet Explorer, you will be prompted once each browsing session to view both secure and insecure content on the same page.  In IE7 and lower, you must click Yes to this prompt.  In IE8, you must click No, because of rewording of the prompt.  Failure to do this properly WILL prevent you from viewing images in emails until you log out of the site fully, close your browser, and open it back up and log in again.