-mailq | grep MAILER-DAEMON | grep ^[0-9A-Z] | awk '{ print $1 }' | sed 's/*$//'
+# usage: ./remove-mailer-daemon.sh [MAILER-DAEMON] | sudo postsuper -d -
+
+from=MAILER-DAEMON
+test ! -z "$1" && from=$1
+mailq | grep $from | grep ^[0-9A-Z] | awk '{ print $1 }' | sed 's/*$//'