I keep receiving emails from Whats App and all emails I receive, say unknown sender

Original Title: Annoying emails

I keep receiving emails from Whats App.  I do not open them. I put them on my blocked senders list, but keep getting them.  If I'm blocking them why do they keep coming.  Also all emails I receive, say unknown sender and I have the choice to allow sender or block and delete.  All these contacts are on my safe list, so why is this happening.