Always block images by default
It seems that yahoo have decided that some senders are trusted, and allows their images to display online images, which means that these companies can tell that the user has read their email.
Yahoo customers would benefit from and appreciate the option to block all online images by default (with the option to allow on a per-message basic).
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Ian Skidmore
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Hi there. You have the option to always block images and be asked if you wish to see them. This option is located at Settings>More Settings>Viewing email>''Show images in messages''> select ''Ask before being shown external images''.