MailCue

What it does

MailCue is an all-in-one email testing server packaged in a single Docker container. Unlike simple catch-all SMTPs, it provides a fully-featured mail stack with Postfix, Dovecot, SpamAssassin, DKIM/DMARC verification, and a modern React UI. Test your email workflows exactly as they behave in production with IMAP/POP3 access, API injection, real-time events, and GPG encryption. Perfect for local development, CI/CD pipelines, and ensuring your transactional emails actually deliver.

• AF
  A fake SMTP server for software integration testing2024 · fakemail.stream · ▲127

  This is a side project of mine. Use this as your SMTP server in a test environment to guarantee that your users don't receive test emails. Looking for feedback, especially on the security side.

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  MailSnag2018 · ▲83

  Automated email testing for dev/staging/QA/CI environments

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  Email Testing By Inbox Pirates2022 · ▲358

  Preview, analyze & test emails with one click

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  Debug Mail2022 · ▲194

  Easy-to-use mail server for developers

• PS
  Posthorn, self-hosted mail gatewayMay 2026 · github.com · ▲83

  Introducing Posthorn, a self hosted email gateway. One docker container (or Go binary) between every self hosted app on your VPS and your transactional email provider. Set up Posthorn once, point your apps to it, done. I was trying to deploy Ghost on a DigitalOcean droplet and found that DO and many different VPS services have started to block the default SMTP ports to try to combat the various types of abuse they get. To actually configure my app, I had to hack together a Postfix relay. In another project, I had a static site which had a contact form, but my free Formspree account was…

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  SMTP‑Test.com2025 · ▲103

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• AG
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• IB
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  AI · Apr 2026 · github.com

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• BC
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• IB
  I built a frontpage for personal blogs▲783

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  AI · Apr 2026 · text.blogosphere.app