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Mac Tiger 10.4.7 Firefox and Thunderbird. When I transmit photos to others with either wintel or mac computers some get a small red X in the upper left hand corner of the box(es) where the photo was. This also happens to wintel computers when transmitting photos. Some recipients get the photo as transmitted. When I send it to me I always get the photo. What is cause and solution?
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OK but can't find a security setting that affects illustrations or jpeg images.
...with illustrations or JPG's, but the format of the E-mail you are using to send them.
The people who receive your E-mail will simply have security settings to prevent messges formed as HTML (like a webpage).
For you, this means E-mail as HTML to show pics immediately when opened, may fall afoul of both ISP and indvidual receivers' security settings. M$ have been shipping security patches for years to break this "feature" too, because HTML simply isn't secure.
http://support.microsoft.com/?id=321847
Some spammer could send you an E-mail formed as HTML that as soon as you opened it activated unwanted code...it's a huge gaping security risk. Most users and ISP's trying to avoid spam, spyware, and active virus threats, would do well to disable E-mail formatted as HTML in one way or another. Of course that breaks the E-mail you send! 
Simply send pictures with E-mail by attaching them (like the rest of the secure world does) to get the job done.
Good luck,
GB.
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