I’ve just upgraded to Mountain Lion, and am having some trouble trying to figure out how to mark messages that slipped through SpamSieve without loading the images in Mail.app.
In previous versions of Mail.app, the images would never load unless you added the address to your contacts. Now it seems they always load unless the message is marked as Junk (which works fine with SpamSieve’s “train as spam”). The problem with that is, you have to click on a message to go to Messages > Train as Spam, and as soon as you click on a message which has slipped through SpamSieve’s filter, the images load.
With Mail.app’s built-in junk mail filter, at least you can right click on the message and go to Mark as > Junk mail, without loading the message into the preview pane, but there are no contextual menu items for training SpamSieve, so I can’t do the right click.
Are there any suggestions for training a message as spam without loading the images?