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A local SMTP server that catches outgoing mail and shows it in a web inbox, for testing mail from your apps. Mail sent to maildev:1025 from other services in this project appears in the web page and is never delivered. This page describes the Levelrail template for MailDev (Mail). It deploys the services below as one Docker Compose app on your own server. Project site: https://maildev.github.io/maildev/. Recommended memory: about 128 MiB.

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Services, ports and volumes

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Environment variables

This template sets no environment variables. Passwords and keys marked as generated are created for you when the app is deployed and stored as secrets. Values are not shown here.

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Security and requirements

Level: Standard. What this template needs:
  • Nothing beyond a standard container: no extra privileges, host mounts or published ports.
What Levelrail adds around it:
  • Automatic HTTPS and an ingress shield in front of every domain.
  • Deploys are gated on the health check before traffic switches.
  • One-step rollback to the previous revision.
  • Exposure report shows what is reachable from outside.
  • Host firewall rules managed for published ports.

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Deploy MailDev with Levelrail

In the dashboard, open Apps, choose New app, then Browse templates, and select MailDev. Review the Compose body and deploy. With the CLI:
See the service template catalog for how templates work, and Getting started if you have not installed Levelrail yet. All templates are listed in the self-host gallery.
Last modified on November 2, 2026