Add sample smtp server in Kubernetes

.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

Chart.yaml

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+apiVersion: v2
+name: smtp
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.4.0"

templates/smtp.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  selector:
+    matchLabels:
+      app.kubernetes.io/instance: {{ .Release.Name }}
+      app.kubernetes.io/component: postfix
+  strategy:
+    type: Recreate
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/instance: {{ .Release.Name }}
+        app.kubernetes.io/component: postfix
+    spec:
+      containers:
+        - name: postfix
+          image: juanluisbaptiste/postfix:{{ .Chart.AppVersion }}
+          command:
+          - /bin/sh
+          - -c
+          - "postconf -e 'inet_protocols = all'; /run.sh"
+          ports:
+            - containerPort: 587
+              name: submission
+          env:
+            - name: SMTP_SERVER
+              value: "{{ .Values.smtp_server }}"
+            - name: SERVER_HOSTNAME
+              value: "{{ .Values.server_hostname }}"
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/component: postfix
+spec:
+  type: ClusterIP
+  ports:
+   - port: 587
+     name: submission
+     targetPort: 587
+  selector:
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/component: postfix

values.yaml

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+smtp_server: ""
+server_hostname: ""