Add flag to log lines that did not match anything

parser.go

 package main
 
 import (
+	"flag"
 	"fmt"
+	"log"
 	"regexp"
 	"strconv"
 )
 
+var logUncaught = flag.Bool("log-uncaught", false, "dump log lines that did not match")
+
 // A delivery is when a message is sent somewhere from within a
 // specific Flow. Deliveries are uniquely identified by their relay
 // attribute (recipients are aggregated by relay). We only keep track
@@ -303,6 +307,8 @@ func (p *Parser) analyze(ts, host, program, message string) error {
 		}
 	}
 
-	//log.Printf("uncaught: %s %s %s", host, program, message)
+	if *logUncaught {
+		log.Printf("uncaught: %s %s", program, message)
+	}
 	return nil
 }