Trying to make use of the access control list feature now available in 8.0.2

In the properties of Distribution List A I added a DL B(which is allowed in the interface) with the intention that anyone on said DL B would be authorized to send to the other DL A.

On the client side, regardless of whether the person sending the email is on the authorized DL B or not, the mail seems to goes out as normal, but there is no error message and the sent properties are blank and it is never delivered.

What am I missing?