A few weeks ago I finished reading an email and clicked delete. That email was the bottom item shown in my new mail list. As it deleted, the next and out-of-sight email was brought up and Thunderbird displayed it. Unfortunately, that email was spam and Thunderbird had correctly labeled it as spam. My email address was then recognized as a live address. My spam has multiplied from one every 6 or 7 days to 6 or 7 a day!
I would recommend that Thunderbird not automatically step into an email that it has already identified as spam even if it is next in line. Step over it or pause. Whatever method, just require the user to select it if the user thinks it is not spam and wants to review it.
