postfix.yml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: postfix
  namespace: default
  labels:
    k8s-app: postfix
    component: ingress-controller
    type: nginx
spec:
  selector:
    matchLabels:
      k8s-app: mail-loadbalancer
      component: ingress-controller
      type: nginx
  template:
    metadata:
      labels:
        k8s-app: mail-loadbalancer
        component: ingress-controller
        type: nginx
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/os
                operator: Exists
      nodeSelector:
        kubernetes.io/os: "linux"
      dnsPolicy: ClusterFirstWithHostNet
      restartPolicy: Always
      terminationGracePeriodSeconds: 60
      containers:
      - name: postfix
        image: 431145989806.dkr.ecr.ap-southeast-1.amazonaws.com/postfix:latest #will change later, for now you'll need to build it from the postfix folder with docker built . -t postfix
        imagePullPolicy: Always
        ports: 
          - name: postfix
            containerPort: 25
            hostPort: 25
            protocol: TCP
      imagePullSecrets:
      - name: regcred