MailSandbox (mailsandbox.com)

What it does

Hi Product Hunt! 👋 We built MailSandbox because we were tired of screenshotting local email tests. Our fake SMTP sandbox allows you to catch and inspect emails sent by your websites or application environments without risking them ever hitting a real user's inbox. Paste the SMTP credentials we provide, into your app config, and we instantly capture the traffic. Why MailSandbox? Most legacy tools feel clunky or are overpriced. We wanted a modern UI/UX that our clients will actually use.

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

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• VT
  VaultSandbox – Test your real MailGun/SES/etc. integrationJan 2026 · vaultsandbox.com · ▲58

  I've spent the last few months working on something I wish I'd had years ago. I kept running into the same issue: CI green, production mail broken. TLS handshake failures, DKIM alignment mismatches, SPF soft-fails ... the stuff that only surfaces when real mail servers are involved. Most test tools (Mailpit, MailHog) are catch-alls. They confirm "an email was sent" but don't validate the protocol. They also aren't designed for network-exposed environments: no auth, unprotected Web UI, easy to enumerate messages. VaultSandbox is my attempt at fixing that. It's a self-hosted SMTP gateway…

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