Running a mailserver in Kubernetes
Running a web server in Kubernetes is easy, but a mail server is more challenging. Most of the challenges have to do with your IP infrastructure, ingress, and load balancer within Kubernetes. Here are things I learned when deploying a mail server based on Postfix on Kubernetes with MetalLB and NGINX ingress. If you have a different setup, things might or might not apply. Prevent mail loops on your secondary MX Your Postfix MX pod is maybe running on a private IP RFC1918, which is fine....