Mail from FedoraForum is always marked as spam?

Mail from FedoraForum is always marked as spam?

Every single email message I get from fedoraforum.org@googlemail.com is automatically placed in my spam folder and marked as spam, even though I have constantly marked them as "not spam". It seems like the spam filter is not learning to allow emails from this address no matter how many times I mark them as "not spam".