Catch all mailbox

I'm trying to enable a catchall mailbox for all recipients that does not exist in my exchange 2013 organization but I cannot do it... it doesn't work.

I have already made a rule:

apply when sender is outside the organization

redirect to catchall@domain

except if sender is inside the organization

I tried disabling recipient filtering too

Get-RecipientFilterConfig | Format-List

RecipientValidationEnabled : False

any ideas? any help????