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By default, Thunderbird blocks remote images and other content in messages from people you don't know. This protects your privacy because spammers can verify your email address by detecting if you viewed a remote image in a message from them. Its also possible to embed an executable (malware) in images. When you receive a message with remote images, Thunderbird will display an alert stating that remote images have been blocked, and the images in the message body will be replaced with simple place-holders....
Its possible to display all images from any sender, though its not recommended since malware can be embedded in images, and spammers will be able to verify your e-mail address. If you want to do this use the Config editor to toggle the preference mailnews.message_display.disable_remote_image to false.
A better alternative would be to use the Config editor to create a mail.trusteddomains setting that specifies what e-mail domains it should automatically display remote images for. This is much easier than having to specify each email address, but you're taking the risk that you won't get any messages with a spoofed From: header in one of those domains. The setting contains a list of domains separated by commas, with no wild cards, white space or subdomains allowed. This change won't take effect until you restart Thunderbird. |
