Change MAILFROM example adress to root@example.org as per RFC 2606

default.conf

@@ -26,7 +26,7 @@ MAILTO="survey@popcon.debian.org"
 # cause problems with spam bouncers, so most people should leave it
 # commented out.
 #
-#MAILFROM="root@nowhere.org"
+#MAILFROM="root@example.org"
 
 # MY_HOSTID is a secret number that the popularity-contest receiver
 # uses to keep track of your submissions.  Whenever you send in a