Here are some possible reasons why the Red X may appear when sending or receiving e-mail, and suggested fixes for each:
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Internet ExplorerProblem: The "Show Pictures" setting has been turned off in Internet Explorer.
Solution: In Internet Explorer's Tools menu, click Internet Options, then click the Advanced tab. Make sure the Show Pictures check box is selected under Multimedia, and click OK.
Problem: Your Internet Explorer security settings are set too high, preventing you from accessing the web site which hosts the image.
Solution: Reset to the default security settings. In Internet Explorer, click on Tools -> Internet Options -> Security -> Default Level.
Your browser settings may prevent images that are being sent through HTTP from being shown within messages.--------------------------------------------------------------------------------
Outlook ExpressProblem: You've installed the Windows XP/SP2 updates and you're being bitten by the "Block images and other external content in HTML e-mail" security option. This is automatically turned ON in Outlook Express after you install Windows XP/SP2.
Solution: Click on Tools -> Options -> Security. Then UNCHECK the "Block images and other external content" check box, and click OK.
Problem: You are the SENDER and others are complaining that they can't see images in emails you sent,
Solution: In Outlook Express, Click Tools -> Options -> Send. Under Mail Sending Format, select HTML, then press the HTML Settings button. Make sure the "Send pictures with messages" box is checked.
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OtherProblem: The image is hosted on a website that's busy, temporarily offline or defunct. Or the image file on the website might have been renamed or deleted.
Solution: Try again later or ask the sender to send it as an attachment instead of an inline image.
Problem: Your anti-virus or firewall is a little too uppity. Check to see if your anti-virus or firewall software has a privacy setting to "disable web bugs".
Solution: Uncheck or turn it off. (The term "web bug" is a misnomer. They are really just harmless tiny images on a web page or email, sometimes used for tracking purposes.)
Problem: The image is hosted on a website, and you're not online.
Solution: Make sure your internet connection is active and try again.
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GmailProblem: You can't see pictures in your Gmail.
Solution:
When you open new messages, some images may not appear immediately. Gmail disables images to protect you from unknown senders, like spammers, who use images and links to verify that your email address is real.
Here's how to view those images:
1. Sign in to Gmail.
2. Open the message.
3. Click Display images below in the green box above your message. Or, if you'd like to always view images from a particular sender, click Always display images from sender@domain.com instead.
If you choose to always display images from a particular sender, you can disable this functionality at any time by following these steps:
1.Sign in to Gmail.
2.Open the message.
3.Click show details at the top of the message pane.
4.Click Don't display from now on.
At the moment, you can't set Gmail to display all images from any sender; you must do this on a per-contact basis.
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FirefoxProblem: You can't see pictures.
Solution: Click on the Firefox button in the upper left and chose Options. Click on the Content Tab and make sure there's a checkmark for "Load images automatically".