Ignore inet if unavailable

[l...@airstreamcomm.net]

I prepared a script to work with check_policy_service using inet, 
however I find that when the service is unavailable Postfix dies and no 
longer accepts messages.  Is there a method that would allow Postfix to 
ignore the inet connection if it were unavailable and continue checking 
other rules?

Running Postfix 2.6.6 on Centos 6.3.