About Tempx

Tempx is a temporary email and email testing platform, built by me, Robioki Denis. One person, no company, no office. I needed a tool, the tool needed a home, and here we are.

Why this exists

I write code for a living. That means signing up for things all the time: testing a registration flow, grabbing a download link, trying a tool that insists on an email before showing you anything. For years my real address went everywhere those forms asked. The newsletters never stopped, and every so often a site I'd long forgotten about turned up in someone's breach dump.

So I tried the temporary email services. Popups, video ads, a captcha to get a mailbox, addresses that died in ten minutes. It felt like paying a tax on not wanting spam. At some point I'd had enough and built my own. Open the page, get an address, receive the mail, throw it away.

Then the developer half of my brain took over. If I'm building signup or password-reset emails, they need somewhere to land, and a sandbox to test the sending side too, the way tools like Mailtrap do it: point your app at a mail server that looks real from the outside, but every message lands in your own inbox for inspection instead of in a customer's. Checking whether an email renders right should never involve emailing an actual stranger.

The last push came from somewhere I didn't expect: AI agents. I use coding agents every day, and sooner or later an agent that's testing a signup needs an inbox of its own, one it can poll and read over an API instead of a browser tab. The agent gets the API. I get the unread badge in my toolbar.

Who Tempx is for

• Developers testing signup, verification and notification email, the developer toolkit shows the API-first workflow.
• QA engineers asserting on OTP, password-reset and notification mail in automated tests, see Tempx for QA.
• Automation builders wiring email into cron jobs, n8n flows or Telegram, see Tempx for Automation.
• AI-agent builders giving Claude, ChatGPT or a coding agent its own scoped inbox over MCP, see Tempx for AI Agents.
• Everyone else who wants a throwaway address for a trial, a download or a Wi-Fi gate, that is the temporary email half, and it needs no account.

What's inside

The inbox. A working address the moment you open the app. The default is a named inbox you pick yourself, public by design, the classic disposable-email model. Need a private test inbox instead? Private Access is a one-click opt-in: an unguessable address that only your browser holds the key to, and it costs you nothing, your custom and random inboxes stay exactly as available as before. Either way, mail shows up in seconds and is displayed safely: HTML is sanitised, attachments are checked by their actual content rather than their file name, remote images wait for your permission, and each message comes with a spam check and delivery details (origin, route). Everything deletes itself on a schedule, with no archive.

An optional account. You never need one to use Tempx. But if you sign in with Google or GitHub, your inboxes survive: you can keep them across devices, hold on to a handful of them, and that's also where the connections below are managed. Signing in is for convenience, never a gate.

MCP for AI agents. Tempx runs an MCP server, so Claude, ChatGPT or your own automation can pair with one inbox and work with it directly: list, read, search, wait for a specific email (handy for verification codes). Pairing happens in your browser with one approval, no tokens pasted into chat, and each connection is scoped to a single inbox with its own expiry and a revoke button.

An SMTP sandbox. This is the Mailtrap-shaped part. Create a credential, point your app's mailer at smtp.tempx.uk:587, and everything it “sends” is captured into your Tempx inbox with the original recipients preserved, perfect for Laravel, Rails or CI runs, and nothing ever reaches a real person. Agents can mint these credentials themselves.

Telegram and a browser extension. The bot (@TempxEmailBot) watches an inbox from your phone, QR codes let you hand one to a colleague for a few minutes, and the Chrome extension keeps your address and unread count in the toolbar.

What Tempx won't do

• It won't relay mail to the outside world, every “send” is captured, so it can't be turned into a spam cannon.
• It doesn't sell data. Advertising, where shown, relies on standard ad cookies and is never targeted with your mail, the privacy policy states exactly what is and isn't shared. The only numbers I look at are anonymous counts, like how many addresses were generated today.
• It's not anonymous or untraceable, and I won't pretend otherwise. The privacy policy says exactly where the limits are.
• It's the wrong tool for accounts that matter, banking, work, anything you might need to recover later. Real inbox for those.

About me

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