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