I'm setting up a test environment for internal use at work, and I need to send email notifications as part of our testing process. Instead of dealing with an external email server for SMTPS, I was thinking of running a lightweight webmail system directly in the Kubernetes cluster. This way, I can avoid the complexities of external mail setup, and if it can be configured using environment variables or a Custom Resource Definition (CRD), it would ideally be deployable with a one-shot manifest with no manual configuration. Are there any recommended solutions out there? I remember using SquirrelMail back in the day, but it seems outdated. RoundCube looks like a modern alternative, and I found an older blog post about integrating it with Kubernetes. Does anyone have more recent experiences or suggestions? I'd prefer something that doesn't send mail externally due to potential sensitivity issues, as well as to sidestep the various security and DNS challenges that come with external services like Mailpit or Mailhog.
2 Answers
What exactly are you testing? Setting up a mail server to avoid spam and ensure proper configuration (DKIM, SPF, MX records, etc.) can be quite the hassle compared to just using an authenticated SMTP server. It might save you a lot of time!
You could try using Dovecot along with RoundCube for your setup. It's a relatively common combo for self-hosted email.
The goal here is purely internal, just a cluster-IP service. I want to give the application we’re testing a destination for sending emails. It doesn’t need to interact with any external servers.