Script to check, if there is an update for mailcow-dockerized. In this case, an email will be sent. It's intended to use in a cron jobs.

check-mailcow-update.sh

#!/bin/bash
set -o nounset
set -o errexit

cd /opt/mailcow-dockerized && ./update.sh --check > /dev/null
exit_code=$?

[ $exit_code -eq 0 ] && echo -e "Subject:MAILCOW: Update available \n\n Update your mailcow instance please!\n" | sendmail root
exit 0