Receiving "Tell" Messages (Whispers)

I'm sure everyone here hates to be receiving this massive messages from Gil Sellers. It really bothers a lot.
We all know we can change the sound when the get the tells, but it still bothers.
Sometimes, specially in big cities, your chat gets so polluted with it that u cant even ready your real messages that u receive from your friends.
That's why i wanted to suggest a thing to be inserted in game: an option that u can allow or not the telling u get from ppl outside your contact list. If the sender isnt on your friend list, Free Company nor any Linkshell u're in, u wont receive it until u disable this option...

What do u think ppl?