Helm Chart for mail server

Hello together,
I am currently trying to install a mail server on kubernetes. I came over 3 more or less popular solutions mail-in-a-box, mailu and mailcow. However, I have not found a helm chart or anything providing a good explanation how I can get it running with kubernetes.
I was wondering if anybody here has an easy to configure mail server running on his cluster and can provide directions for a helm chart.