Stalwart: add smtp relay smtp2go

stalwart/templates/configmap.yaml

@@ -84,6 +84,18 @@ data:
     user = "%{env:STALWART_ADMIN_USER}%"
     secret = "%{env:STALWART_ADMIN_PASSWORD}%"
 
+    [remote."smtp2go"]
+    address = "mail-eu.smtp2go.com"
+    port = 2525
+    protocol = "smtp"
+    auth.username = "%{env:SMTP2GO_USER}%"
+    auth.secret = "%{env:SMTP2GO_PASSWORD}%"
+    tls.enable = true
+    tls.allow-invalid-certs = false
+
+    [queue.outbound]
+    next-hop = ["smtp2go"]
+
     [certificate."default"]
     cert = "%{file:/opt/stalwart/certs/tls.crt}%"
     private-key = "%{file:/opt/stalwart/certs/tls.key}%"

stalwart/templates/deployment.yaml

@@ -33,6 +33,16 @@ spec:
             secretKeyRef:
               name: {{ include "stalwart.fullname" . }}-admin
               key: pw
+        - name: SMTP2GO_USER
+          valueFrom:
+            secretKeyRef:
+              name: {{ include "stalwart.fullname" . }}-smtp2go
+              key: user
+        - name: SMTP2GO_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: {{ include "stalwart.fullname" . }}-smtp2go
+              key: pw
         livenessProbe:
           httpGet:
             path: /healthz/live