ansible-role-postfix/files/remove_queued_messages.sh

#!/bin/bash
set -euo pipefail
if [[ "$1" == "" ]]
then
    echo "Indicate a string to search in the postqueue."
    exit 54
fi
postqueue -p | grep -v '^-' | sed ':a;N;$!ba;s/\n\n/ENTER/g' | sed ':a;N;$!ba;s/\n/ /g' | sed 's/ENTER/\n/g' | grep "$1" |awk '{print($1)}' | while read -r KMSGID
do
    echo "Removing message with ID '${KMSGID}'..."
    postsuper -d "$KMSGID"
done