Delete queue di mail queue ----biar ndak lupa yah--- :) :

mailq | tail +2 | grep -v '^ *(' | awk  'BEGIN { RS = "" } { if ($8 == "user@example.com" && $9 == "") print $1 }' | tr -d '*!' | postsuper -d -

# $7=sender, $8=recipient1, $9=recipient2