diff --git a/mailman3/.helmignore b/mailman3/.helmignore
new file mode 100644
index 0000000..0e8a0eb
--- /dev/null
+++ b/mailman3/.helmignore
@@ -0,0 +1,23 @@
+# 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/
diff --git a/mailman3/Chart.yaml b/mailman3/Chart.yaml
new file mode 100644
index 0000000..ce9bd1c
--- /dev/null
+++ b/mailman3/Chart.yaml
@@ -0,0 +1,23 @@
+apiVersion: v2
+name: mailman3
+description: A Helm chart to deploy Mailman3 to 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: 0.0.1
+
+# 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.
+appVersion: 0.3.8
diff --git a/mailman3/templates/NOTES.txt b/mailman3/templates/NOTES.txt
new file mode 100644
index 0000000..0487411
--- /dev/null
+++ b/mailman3/templates/NOTES.txt
@@ -0,0 +1,20 @@
+{{- if .Values.ingress.enabled }}
+Application URL:
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ .Values.ingress.host }}
+{{- else if contains "NodePort" .Values.service.type }}
+Get the application URL by running these commands:
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "mailman3.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+Get the application URL by running these commands:
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "mailman3.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "mailman3.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
+  echo http://$SERVICE_IP:{{ .Values.service.port }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+Get the application URL by running these commands:
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "mailman3.name" . }},app.kubernetes.io/instance={{ .Release.Name }},app.kubernetes.io/component=web" -o jsonpath="{.items[0].metadata.name}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl port-forward $POD_NAME 8080:80
+{{- end }}
diff --git a/mailman3/templates/_helpers.tpl b/mailman3/templates/_helpers.tpl
new file mode 100644
index 0000000..9c2f80b
--- /dev/null
+++ b/mailman3/templates/_helpers.tpl
@@ -0,0 +1,88 @@
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "mailman3.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "mailman3.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "mailman3.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "mailman3.labels" -}}
+helm.sh/chart: {{ include "mailman3.chart" . }}
+{{ include "mailman3.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "mailman3.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "mailman3.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "mailman3.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "mailman3.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create the core claimName: existingClaim if provided, otherwise claimNameOverride if provided, otherwise mailman3-core (or other fullname if overriden)
+*/}}
+{{- define "core.claimName" -}}
+{{- if .Values.core.persistence.existingClaim -}}
+{{- .Values.core.persistence.existingClaim -}}
+{{- else if .Values.core.persistence.claimNameOverride -}}
+{{- .Values.core.persistence.claimNameOverride -}}
+{{- else -}}
+{{ include "mailman3.fullname" . }}-core
+{{- end -}}
+{{- end -}}
+
+{{/*
+Create the web claimName: existingClaim if provided, otherwise claimNameOverride if provided, otherwise mailman3-web (or other fullname if overriden)
+*/}}
+{{- define "web.claimName" -}}
+{{- if .Values.web.persistence.existingClaim -}}
+{{- .Values.web.persistence.existingClaim -}}
+{{- else if .Values.web.persistence.claimNameOverride -}}
+{{- .Values.web.persistence.claimNameOverride -}}
+{{- else -}}
+{{ include "mailman3.fullname" . }}-web
+{{- end -}}
+{{- end -}}
diff --git a/mailman3/templates/core.yaml b/mailman3/templates/core.yaml
new file mode 100644
index 0000000..9606e8f
--- /dev/null
+++ b/mailman3/templates/core.yaml
@@ -0,0 +1,159 @@
+{{- $clusterDomain := default "cluster.local" .Values.clusterDomain}}
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "mailman3.fullname" . }}-core
+  labels:
+    {{- include "mailman3.labels" . | nindent 4 }}
+    app.kubernetes.io/component: core
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      {{- include "mailman3.selectorLabels" . | nindent 6 }}
+      app.kubernetes.io/component: core
+  template:
+    metadata:
+    {{- with .Values.core.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+      labels:
+        {{- include "mailman3.selectorLabels" . | nindent 8 }}
+        app.kubernetes.io/component: core
+    spec:
+      {{- with .Values.core.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      securityContext:
+        {{- toYaml .Values.core.podSecurityContext | nindent 8 }}
+      volumes:
+        - name: core-data
+          persistentVolumeClaim:
+            claimName: {{ include "core.claimName" . }}
+      containers:
+        - name: mailman-core
+          securityContext:
+            {{- toYaml .Values.core.securityContext | nindent 12 }}
+          image: "{{ .Values.core.image.repository }}:{{ .Values.core.image.tag | default .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.core.image.pullPolicy }}
+          env:
+            - name: HYPERKITTY_API_KEY
+              value: {{ .Values.hyperkittyApiKey }}
+            - name: HYPERKITTY_URL
+              value: http://{{ include "mailman3.fullname" . }}-web.{{ .Release.Namespace }}.svc.{{ $clusterDomain }}/hyperkitty
+            - name: MTA
+              value: postfix
+            - name: SMTP_HOST
+              value: {{ include "mailman3.fullname" . }}-core.{{ .Release.Namespace }}.svc.{{ $clusterDomain }}
+            - name: DATABASE_CLASS
+              value: mailman.database.sqlite.SQLiteDatabase
+            - name: DATABASE_URL
+              value: "sqlite:////opt/mailman/var/data/mailman.db"
+          ports:
+            - name: api
+              containerPort: 8001
+              protocol: TCP
+            - name: lmtp
+              containerPort: 8024
+              protocol: TCP
+#          livenessProbe:
+#            httpGet:
+#              path: /3.1/system/versions
+#              port: api
+#              httpHeaders:
+#              - name: Authorization
+#                value: cmVzdGFkbWluOnJlc3RwYXNz   # echo -n "restadmin:restpass" | base64
+#          readinessProbe:
+#            httpGet:
+#              path: /
+#              port: api
+          volumeMounts:
+            - name: core-data
+              mountPath: /opt/mailman
+          resources:
+            {{- toYaml .Values.core.resources | nindent 12 }}
+        - name: postfix
+          image: boky/postfix:latest
+          env:
+            - name: TZ
+              value: 'Europe/Berlin'
+            - name: INBOUND_DEBUGGING
+              value: '1'
+            - name: ALLOWED_SENDER_DOMAINS
+              value: "*"  # dummy wegen POSTFIX_smtpd_recipient_restrictions...
+#            - name: POSTFIX_myhostname
+#              value: {{ .Values.ingress.host | quote }}
+            - name: POSTFIX_append_at_myorigin
+              value: "no"
+            - name: POSTFIX_append_dot_mydomain
+              value: "no"
+            - name: POSTFIX_recipient_delimiter
+              value: "+"
+            - name: POSTFIX_unknown_local_recipient_reject_code
+              value: "550"
+            - name: POSTFIX_owner_request_special
+              value: "no"
+            - name: POSTFIX_always_add_missing_headers
+              value: "yes"
+#            - name: POSTFIX_virtual_mailbox_maps
+#              value: regexp:/mailman/postfix_lmtp
+            - name: POSTFIX_transport_maps
+              value: regexp:/mailman/postfix_lmtp
+            - name: POSTFIX_local_recipient_maps
+              value: regexp:/mailman/postfix_lmtp
+            - name: POSTFIX_relay_domains
+              value: regexp:/mailman/postfix_domains
+            - name: POSTFIX_smtpd_recipient_restrictions
+              value: "permit_mynetworks,reject_non_fqdn_recipient,reject_unauth_destination"
+#              value: "reject_non_fqdn_recipient, reject_unknown_recipient_domain, check_sender_access static:OK, reject_unauth_destination"  # ugly... is there better way to avoid relaying denied?
+          ports:
+            - name: smtp
+              containerPort: 25
+              protocol: TCP
+          volumeMounts:
+            - name: core-data
+              subPath: var/data
+              mountPath: /mailman
+      {{- with .Values.core.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.core.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.core.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+      maxSurge: 0
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "mailman3.fullname" . }}-core
+  labels:
+    {{- include "mailman3.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - name: rest
+      port: 8001
+      protocol: TCP
+    - name: lmtp
+      port: 8024
+      protocol: TCP
+    - name: smtp
+      port: 25
+      protocol: TCP
+  selector:
+    {{- include "mailman3.selectorLabels" . | nindent 4 }}
+    app.kubernetes.io/component: core
\ No newline at end of file
diff --git a/mailman3/templates/ingress.yaml b/mailman3/templates/ingress.yaml
new file mode 100644
index 0000000..7a255ec
--- /dev/null
+++ b/mailman3/templates/ingress.yaml
@@ -0,0 +1,33 @@
+{{- if .Values.ingress.enabled -}}
+{{- $fullName := include "mailman3.fullname" . -}}
+{{- $svcPort := .Values.service.port -}}
+{{- if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1beta1
+{{- else -}}
+apiVersion: extensions/v1beta1
+{{- end }}
+kind: Ingress
+metadata:
+  name: {{ $fullName }}
+  labels:
+    {{- include "mailman3.labels" . | nindent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  {{- if .Values.ingress.tls }}
+  tls:
+    - hosts:
+      - {{ .Values.ingress.host }}
+      secretName: {{ include "mailman3.fullname" . }}-certificate
+  {{- end }}
+  rules:
+  - host: {{ .Values.ingress.host | quote }}
+    http:
+      paths:
+      - path: /
+        backend:
+          serviceName: {{ include "mailman3.fullname" . }}-web
+          servicePort: 80
+{{- end }}
diff --git a/mailman3/templates/pvc.yaml b/mailman3/templates/pvc.yaml
new file mode 100644
index 0000000..2e0676c
--- /dev/null
+++ b/mailman3/templates/pvc.yaml
@@ -0,0 +1,47 @@
+{{- if not .Values.core.persistence.existingClaim }}
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "core.claimName" . }}
+{{- if .Values.core.persistence.annotations }}
+  annotations:
+{{ toYaml .Values.core.persistence.annotations | indent 4 }}
+{{- end }}
+spec:
+  accessModes:
+    - {{ .Values.core.persistence.accessMode }}
+  resources:
+    requests:
+      storage: {{ .Values.core.persistence.size }}
+  {{- if .Values.core.persistence.storageClass }}
+  {{- if (eq "-" .Values.core.persistence.storageClass) }}
+  storageClassName: ""
+  {{- else }}
+  storageClassName: {{ .Values.core.persistence.storageClass }}
+  {{- end }}
+  {{- end }}
+{{- end }}
+---
+{{- if not .Values.web.persistence.existingClaim }}
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "web.claimName" . }}
+{{- if .Values.web.persistence.annotations }}
+  annotations:
+{{ toYaml .Values.web.persistence.annotations | indent 4 }}
+{{- end }}
+spec:
+  accessModes:
+    - {{ .Values.web.persistence.accessMode }}
+  resources:
+    requests:
+      storage: {{ .Values.web.persistence.size }}
+  {{- if .Values.web.persistence.storageClass }}
+  {{- if (eq "-" .Values.web.persistence.storageClass) }}
+  storageClassName: ""
+  {{- else }}
+  storageClassName: {{ .Values.web.persistence.storageClass }}
+  {{- end }}
+  {{- end }}
+{{- end }}
diff --git a/mailman3/templates/tests/test-connection.yaml b/mailman3/templates/tests/test-connection.yaml
new file mode 100644
index 0000000..ffe3cef
--- /dev/null
+++ b/mailman3/templates/tests/test-connection.yaml
@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: "{{ include "mailman3.fullname" . }}-test-connection"
+  labels:
+    {{- include "mailman3.labels" . | nindent 4 }}
+  annotations:
+    "helm.sh/hook": test-success
+spec:
+  containers:
+    - name: wget
+      image: busybox
+      command: ['wget']
+      args: ['{{ include "mailman3.fullname" . }}:{{ .Values.service.port }}']
+  restartPolicy: Never
diff --git a/mailman3/templates/web.yaml b/mailman3/templates/web.yaml
new file mode 100644
index 0000000..af9fc41
--- /dev/null
+++ b/mailman3/templates/web.yaml
@@ -0,0 +1,127 @@
+{{- $clusterDomain := default "cluster.local" .Values.clusterDomain}}
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "mailman3.fullname" . }}-web
+  labels:
+    {{- include "mailman3.labels" . | nindent 4 }}
+    app.kubernetes.io/component: web
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      {{- include "mailman3.selectorLabels" . | nindent 6 }}
+      app.kubernetes.io/component: web
+  template:
+    metadata:
+    {{- with .Values.web.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+      labels:
+        {{- include "mailman3.selectorLabels" . | nindent 8 }}
+        app.kubernetes.io/component: web
+    spec:
+      {{- with .Values.web.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      securityContext:
+        {{- toYaml .Values.web.podSecurityContext | nindent 8 }}
+      volumes:
+        - name: web-data
+          persistentVolumeClaim:
+            claimName: {{ include "web.claimName" . }}
+      containers:
+        - name: mailman-web
+          securityContext:
+            {{- toYaml .Values.web.securityContext | nindent 12 }}
+          image: "{{ .Values.web.image.repository }}:{{ .Values.web.image.tag | default .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.web.image.pullPolicy }}
+          env:
+            - name: HYPERKITTY_API_KEY
+              value: {{ .Values.hyperkittyApiKey }}
+            - name: SECRET_KEY
+              value: {{ .Values.djangoSecretKey }}
+            - name: MAILMAN_REST_URL
+              value: http://{{ include "mailman3.fullname" . }}-core.{{ .Release.Namespace }}.svc.{{ $clusterDomain }}:8001
+            - name: POSTORIUS_TEMPLATE_BASE_URL
+              value: http://{{ include "mailman3.fullname" . }}-web.{{ .Release.Namespace }}.svc.{{ $clusterDomain }}:80
+            {{- if .Values.ingress.enabled }}
+            - name: SERVE_FROM_DOMAIN
+              value: {{ .Values.ingress.host | quote }}
+            {{- end }}
+            - name: DATABASE_URL
+              value: sqlite://///opt/mailman-web-data/mailmanweb.db
+            - name: DATABASE_TYPE
+              value: sqlite
+            - name: MAILMAN_ADMIN_USER
+              value: {{ .Values.admin.username }}
+            - name: MAILMAN_ADMIN_EMAIL
+              value: {{ .Values.admin.email }}
+            {{- if .Values.smtp }}
+            - name: SMTP_HOST
+              value: {{ .Values.smtp }}
+            {{- else }}
+            - name: SMTP_HOST
+              value: {{ include "mailman3.fullname" . }}-core.{{ .Release.Namespace }}.svc.{{ $clusterDomain }}
+            {{- end }}
+          args:
+            - uwsgi
+            - --ini
+            - /opt/mailman-web/uwsgi.ini
+            - --static-map
+            - /static=/opt/mailman-web-data/static
+          ports:
+            - name: http
+              containerPort: 8000
+              protocol: TCP
+          livenessProbe:
+#            httpGet:
+#              path: /
+#              port: http
+#          readinessProbe:
+#            httpGet:
+#              path: /
+#              port: http
+          volumeMounts:
+            - name: web-data
+              mountPath: /opt/mailman-web-data
+          resources:
+            {{- toYaml .Values.web.resources | nindent 12 }}
+      {{- with .Values.web.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.web.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.web.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+      maxSurge: 0
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "mailman3.fullname" . }}-web
+  labels:
+    {{- include "mailman3.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - name: http
+      port: 80
+      targetPort: 8000
+      protocol: TCP
+  selector:
+    {{- include "mailman3.selectorLabels" . | nindent 4 }}
+    app.kubernetes.io/component: web
diff --git a/mailman3/values.yaml b/mailman3/values.yaml
new file mode 100644
index 0000000..c25b798
--- /dev/null
+++ b/mailman3/values.yaml
@@ -0,0 +1,80 @@
+# Default values for mailman3.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+# These are the settings that you MUST change before deploying:
+# Initial Settings for the admin account:
+#admin:
+#  username: mailadmin
+#  email: user@example.org
+#
+# some keys have to be provided...
+#hyperkittyApiKey: supersecret
+#djangoSecretKey: supersecret
+
+imagePullSecrets: []
+nameOverride: ""
+fullnameOverride: ""
+
+core:
+  image:
+    repository: maxking/mailman-core
+  podAnnotations: {}
+  podSecurityContext: {}
+  # fsGroup: 2000
+  securityContext: {}
+  # capabilities:
+  #   drop:
+  #   - ALL
+  # readOnlyRootFilesystem: true
+  # runAsNonRoot: true
+  # runAsUser: 1000
+  nodeSelector: {}
+  tolerations: []
+  affinity: {}
+  resources: {}
+  # We usually recommend not to specify default resources and to leave this as a conscious
+  # choice for the user. This also increases chances charts run on environments with little
+  # resources, such as Minikube. If you do want to specify resources, uncomment the following
+  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+  # limits:
+  #   cpu: 100m
+  #   memory: 128Mi
+  # requests:
+  #   cpu: 100m
+  #   memory: 128Mi
+  persistence:
+    size: 100Gi
+    accessMode: ReadWriteOnce
+
+web:
+  image:
+    repository: maxking/mailman-web
+  podAnnotations: {}
+  podSecurityContext: {}
+  securityContext: {}
+  nodeSelector: {}
+  tolerations: []
+  affinity: {}
+  resources: {}
+  persistence:
+    size: 100Gi
+    accessMode: ReadWriteOnce
+
+service:
+  type: ClusterIP
+
+ingress:
+  enabled: false
+  tls: false
+  annotations:
+    # use NGINX Ingress Controller
+    #kubernetes.io/ingress.class: "nginx"
+    # use Cert-Manager for LetsEncrypt Certificates
+    #cert-manager.io/issuer: "letsencrypt-prod"
+  host: mailman3.example.org
+
+
+
+
+