E-mail Trouble Shooting

Why are pictures in my HTML e-mails replaced with ugly warning signs?
"This image has been removed for security reasons."

There are two kinds of images that come with your HTML e-mail: the ones that come attached with the e-mail itself, and others that link to remote sites. Images that are linked to remote sites are considered "unsafe" for the following reasons:
  1. Spammers can abuse this to validate your e-mail address
  2. The sender can know instantly if you have read their e-mail or not (privacy concern)
  3. Finding out information about your browser, operating system, and your mailserver (security concern).
For these reasons SquirrelMail does not display these "unsafe" images by default, but instead shows you a warning sign. A link is provided to show the images for that particular mail. If you know that the e-mail came from a trustworthy source, you can use the Unsafe Image Rules plugin to always images from that source.