If I SEND an e-mail to that person the reply goes straight to the folder set up in rules - great. That's what I wanted it to do.
But if that person send me a NEW e-mail - that e-mail ends up in Junk - but it isn't marked as junk - not into the folder it's supposed to go in.
So, why do replies work OK but not NEW e-mails? The e-mail address is the same. I've even tried deleteing the rule and re-instating it. This problem has followed me from Snow Leopard to Lion and now to Mountain Lion. It only ever happens with this one e-mail address. All other rules work great.
I've learned to live with the problem but would be eternally grateful if anyone has a solution!
MacBook Pro (Retina, Mid 2012), OS X Mountain Lion (10.8.2), Using external Cinema Display