MailSandbox (mailsandbox.com)

MailSandbox (mailsandbox.com)

The collaborative email testing platform for modern teams

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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.
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Free
Launch tags:Email•Productivity•Developer Tools
Launch Team / Built With
Intercom
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What do you think? …

Huub Duinmeijer
Maker
📌
Hi Product Hunt! 👋 We built MailSandbox because we were tired of screenshotting local email tests to show our PMs (and don't get me started on explaining to clients how to log into our dev tools). 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. How it works: You simply paste the SMTP credentials we give you into your app config (Local, Staging, or Dev), and we instantly capture the traffic. Why we built a new tool in this space: Most legacy tools feel clunky or are overpriced. We wanted a modern UI/UX that actually fits a 2025 workflow. ⚡️ Shareable Links: Generate a public link for any email. Send it to your client/PM for approval. No login required for them. 🔒 Private Inboxes: Stop digging through a shared "team dump." Get your own private sandbox for local dev. 🛡️ Spam Analysis: Check your spam score and validate HTML/CSS before you push to production. I’d love to hear your feedback on the UI and the flow. Let me know what you think! 👇
Ronald

I'm a retired developer and system manager. Mailsandbox is a very useful to test the mail functionality in your development environment.

I used and tried it with HTML and a Python script but I think you can use it with a lot of languages.

It looks very good and works very well and it is user/developer friendly.

I had wish it was available in my working days.

Well done.

Best regards,

Ronald