Yahoo Email Overzealous?

I've used Yahoo email for at least eight years, probably since its inception and my satisfaction has been good.

Lately, it seems that the new & improved Yahoo Email has become overzealous about labeling legit email as spam and dumping it into the Spam Folder. This angers me to no end because I have specifically toggled said emails as Not Spam!

So a warning to all Yahoo Email users, frequently check your Spam Folder for legit content lest, you miss out. I have been waiting for an invitation to an online community for about two weeks and lo & behold, it's been sitting in the Spam Folder since January 31st. Grrr!