Enable easier signaling of non spam mail

[Edu]

Not very easy to label a spam mail as safe. You have to drag it into inbox and again next time the sender's mail is found in spam. 

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[filiprimet]

Same problem: Impossible to unlabel from spam a safe email account. I tried multiple configurations of Anti-Spam configuration in Thunderbird, but anything results.