If you have a Yahoo Mail account, then effective 2007 all the attachment photographs in your e-mail account were migrated to Flickr.com.
Most worrying fact is that, even though your attachment photos of the e-mail account are private, they are open to any Flickr.com member at your Flickr.com account as default after migration.
It is recommended to visit Flickr.com and login through your Yahoo credentials and either change the settings or if you are not using it, delete the Flickr.com account. You can create it again when required.
Sunit Ronnie Ghosh