-e s',^Message-ID: <.*>$,Message-ID: <XXX>,' \
-e s',^\(Content-Type: text/plain\); charset=us-ascii$,\1,' < sent_message >OUTPUT
cat <<EOF >EXPECTED
-e s',^Message-ID: <.*>$,Message-ID: <XXX>,' \
-e s',^\(Content-Type: text/plain\); charset=us-ascii$,\1,' < sent_message >OUTPUT
cat <<EOF >EXPECTED