Intermittent deliverability

[looksystems]

I've used mailpit on my local machine and it's invaluable, thank you.

Recently, I deployed it to a kubernetes cluster but am having problems with "intermittent" deliverability.

From the same application, there are times when emails come straight through to mailpit and other times they just appear to get "lost" ie. logging in the application just before sending is successful and no exceptions are recorded.

Using latest release, as of today.

Kubernetes config:

---

apiVersion: v1
kind: ConfigMap
metadata:
namespace: services-ns
name: mailpit-service-config
data:
MP_VERBOSE: "true"
MP_UI_AUTH: "admin:***"

---

apiVersion: apps/v1
kind: Deployment
metadata:
namespace: services-ns
name: mailpit-service-deployment
spec:
selector:
matchLabels:
app.kubernetes.io/name: mailpit-service-app
replicas: 1
template:
metadata:
labels:
app.kubernetes.io/name: mailpit-service-app
spec:
containers:
- image: axllent/mailpit:latest
imagePullPolicy: Always
name: mailpit-service-app
ports:
- containerPort: 8025
protocol: TCP
name: http
- containerPort: 1025
protocol: TCP
name: smtp-tcp
envFrom:
- configMapRef:
name: mailpit-service-config

---

apiVersion: v1
kind: Service
metadata:
namespace: services-ns
name: mailpit-service-service
spec:
ports:
- port: 8025
protocol: TCP
name: http-sv
targetPort: http
- port: 1025
protocol: TCP
name: smtp-sv-tcp
targetPort: smtp-tcp
type: NodePort
selector:
app.kubernetes.io/name: mailpit-service-app

---

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
namespace: services-ns
name: mailpit-service-ingress
annotations:
alb.ingress.kubernetes.io/certificate-arn: arn:aws:acm:eu-west-1:redacted:certificate/redacted
alb.ingress.kubernetes.io/listen-ports: '[{"HTTPS": 443}]'
alb.ingress.kubernetes.io/scheme: internet-facing
alb.ingress.kubernetes.io/target-type: ip
spec:
ingressClassName: alb
rules:
- host: mailpit.reacted.domain
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: mailpit-service-service
port:
number: 8025
tls:
- hosts:
- mailpit.reacted.domain

Laravel application sending via SMTP to:

MAIL_FROM_NAME: "Test User"
MAIL_FROM_ADDRESS: "no-reply@redacted.domain"
MAIL_HOST: mailpit-service-service.services-ns.svc.cluster.local
MAIL_MAILER: "smtp"
MAIL_PORT: "1025"

Is this a known issue or have I configured something incorrectly?

Any help or assistance would be greatly appreciated. Thank you.

[axllent]

I'm afraid I can't be of any use with regards to Kubernetes (lack of experience), but I can maybe help you work out what's going on.

When you say intermittent issues, what actually happens when these messages get lost? Are they actually delivered via SMTP, or is that what sometimes works and sometimes doesn't? If they get delivered (according to the client), do they appear in the web UI when you manually refresh the browser?

Any Internal issues in Mailpit (eg: problem accessing or writing to the database etc) will be logged, so I'm assuming this should be easy to debug.

[github-actions]

This issue has been marked as stale because it has been open for 7 days with no activity.