MailSandbox (mailsandbox.com)
The collaborative email testing platform for modern teams
MailSandbox (mailsandbox.com) launched on December 30, 2025 with 4 votes, #3,973 of 11,628 launches that month.
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.
A fake SMTP sandbox that catches staging emails and organizes them by client and project. Preview HTML, check spam score, and share for review. Start free.
The fake SMTP sandbox that catches emails from any staging environment. And organizes them for all of your clients and projects. Four lines in .env . Works with anything that speaks SMTP: Laravel, Rails, Django, Node, or a raw socket. MAIL_HOST =smtp.mailsandbox.com MAIL_PORT =2525 MAIL_USER =msb_a8f21c MAIL_PASS = •••••••••• 02 We catch every email Password resets, receipts, digests: every message your app tries to send is captured the instant it leaves, with the full HTML intact. Nothing reaches a real recipient. Every inbox belongs to a project, every project to a client, the structure your agency already thinks in. Open a message to review the full HTML, then share a link so clients can…from mailsandbox.com
Does a similar job
all alternatives →- AFA 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.
MailFrom.dev – A sandbox SMTP for devs2025 · mailfrom.dev · ▲17Hi HN, Two months ago, we launched MailFrom.dev, a fake SMTP server for developers who want to test email sending without hitting real inboxes – think of it like a simpler, cheaper alternative to Mailtrap or Mailhog with a focus on ease of use. Since then: - We’ve had 55 developers sign up with 4 paid subscription active and 821 test emails sent - Improved stability, speed, and small features our early users needed - Worked hard to add roles (wich will be released later next week) What's improved: - Better UI to inspect headers, bodies, and attachments - Faster inbox refresh and sync between…
- FSFake SMTP server as a service2017 · develmail.com · ▲149
VaultSandbox – Test your real MailGun/SES/etc. integrationJan 2026 · vaultsandbox.com · ▲58I'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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