{TAIL ~ Incoming message packets} are intercepted and screened for readily discoverable characteristics indicative of {HEAD ~ an infected message} 
{ TAIL ~ Incoming message packets } are intercepted and screened for readily discoverable characteristics indicative of { HEAD ~ an infected message }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD