Hello,
Kyatric is right it's an automated spam detection service incorrectly marking you as a suspected spammer.
Your account is now whitelisted so you wont ever see the notice again!
I understand it is frustrating, however the only alternative we seem to have is to disable it completely and be flooded with spam. Generally speaking, it does seem to catch just about all of the genuine spammers but it does hit a false positive every now and then.