I am running Mountain Lion 10.8 and use Mail.app for my email mostly. I recently purchased a product from Amazon, somewhere I order from frequently, and noticed that I didn't receive the usual sales receipt - or so I thought. I looked in Gmail's All Mail folder and noticed it there. Mail.app had deemed it Junk and put it in the Junk folder (which I don't believe is accessible from iOS devices with typical IMAP email set up on them).
This is what my Junk Mail preferences look like when this happened:
Is there a way to tell Mail.app that a certain sender (preferably something such as "all senders from @example.com are not junk" vs. the actual firstname.lastname@example.org) is not Junk without actually putting the sender into my contacts?