Exchange 2013 prevent spam from my own domain

Dear All,

Back in Exchange 2007 we used to prevent spam from own domain by modifying permissions on the Receive Connector, as show on this link.

http://exchangepedia.com/2008/09/how-to-prevent-annoying-spam-from-your-own-domain.html

When I modify the same permissions on Exchange 2013 Default Front Receive Connector, the spam is still allowed threw.

Is there a different aproche to achieve the same result in Exchange 2013?

Thank you

Bujar