Base
Hardened build
minimal ports, security patches applied at build time
smtp4dev
AWS
Azure
Streaming & Messaging
2 variations
smtp4dev, a fake SMTP server that catches outbound mail from your applications and shows every message in a web UI inbox, ready from first boot.
Variations
Choose the operating system, cloud and version you need. Every variation is the same hardened smtp4dev image, built and supported by cloudimg.
| Product | Cloud | Operating system | Version | |
|---|---|---|---|---|
| smtp4dev - Fake SMTP Server & Email Testing UI | AWS | — | Standard | View · Guide |
| smtp4dev on Ubuntu 24.04 | Azure | Ubuntu 24.04 | Standard | View · Guide |
Overview
smtp4dev is a fake SMTP server for development and testing. It accepts the mail your applications send, stores it locally, and shows every captured message in a modern web UI inbox instead of delivering it to real recipients, so you can safely point a development, test or staging environment at it and inspect exactly what your application would have sent: rendered HTML, plain text and raw source, attachments, every header, and an HTML client-compatibility analysis. It also speaks IMAP, so captured mail can be browsed from any standard mail client.
Why the cloudimg image
The cloudimg image delivers smtp4dev already installed and running behind an nginx reverse proxy, with the .NET runtime installed from the distribution archive so it stays patched. A unique web password is generated and proven on first boot, refusing unauthenticated and wrong-password requests before it records the new one, and the captured-mail SQLite store lives on its own dedicated data volume. Paired with a step by step deploy guide and backed by 24/7 cloudimg support.
Common uses
- Inspect the mail your application sends from development and staging without any risk of it reaching real recipients
- Debug transactional email templates, HTML rendering, attachments and headers before they go out
- Wire the REST API into automated integration tests that assert a message was sent
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