Suppressing "Attention" status in IS 2012

Upgraded to IS 2012 from 2011 & turned off outbound e-mail scan permanently as required in my environment. 

 

Now  System Status is orange ("Attention") and complains about this. 

 

In 2011 I could "ignore" this condition so status would be green ("fully protected").

 

How do I do the same thing in 2012?

 

Thanks.