Log message-id of each message as well

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
diff --git a/common.rc b/common.rc
index 712a442..a72409e 100644
--- a/common.rc
+++ b/common.rc
@@ -3,8 +3,10 @@
 LOGFILE=/var/log/grokmirror/procmail.log
 PARSEMAIL=/usr/local/bin/parsemail.sh
 LISTID=`formail -zxList-Id:`
+MSGID=`formail -zxMessage-Id:`
 LOG="---`date +'%F %T.%N'`---
  List-Id: $LISTID
+  Msg-Id: $MSGID
 "
 
 # vim: ts=2 sw=2 sts=2 et syntax=procmail