A persistent disposable inbox for Chrome & Brave — with one-click form autofill, OTP copy and zero setup.
Install · Features · Screenshots · Releases
Most temp-mail sites make you refresh a page and fight CAPTCHAs. TempMail lives in your browser: a real inbox that polls in the background, fills any signup form in one keystroke, and keeps the same address for as long as you want it — until you press New. No account, no API keys, no build step.
- Address that stays put — same address across tabs, sessions and browser restarts until you rotate it
- One-click form autofill — the mini email icon inside every email field: click = fill email,
Shift+click= autofill the whole form - Full form filling — email, name, username, password, gender, age/DOB, phone, address, city, state, ZIP/PIN, country (dropdowns & radios included)
- Fake identity generator — US, India, UK, Canada, Australia, Germany, with city/state/postcode kept consistent
- Live inbox — background polling with unread badge and desktop notifications
- OTP detection — verification codes surface as one-click copy chips; verification links detected too
- Safe message viewer — sandboxed iframe, remote images blocked until you allow them, attachments downloadable
- Privacy controls — pause button (⏸) stops all background checks, wake-ups and notifications until you resume; address history (last 5)
- Three mail providers — Catchmail (3 domains + custom domains via MX), temp.tf, and MyGmail: your own Gmail via +aliases and dot variants, switchable in Settings
- Native-feeling design — clean system-font UI in the spirit of Apple's Passwords and Notes: grouped lists, automatic light/dark, honest waiting states, visible focus
- MyGmail provider — use your own Gmail as the disposable address:
you+tag@gmail.com(+aliases) ory.o.u@gmail.com(dot variants), filtered per address through MailAPI. Key stays in local storage; the MailAPI host is an optional permission granted only when you pick MyGmail. See MyGmail setup. - Pause button — ⏸ in the popup header halts all automatic polling, alarms, wake-ups and notifications; ↻ still refreshes manually, and resuming catches up immediately.
- Redesigned popup — the toolbar popup was rebuilt as a clean, native-feeling utility: system typography, inset grouped lists with hairline separators, native-style switches / segmented controls / pop-up menus, semantic colours and automatic light/dark. Autofill is the primary action; the inbox leads each message with its code. No web fonts or remote assets — the popup never makes a request of its own.
- Popup that fits its content — the height always matches what's shown, up to Chrome's 600 px cap: short with an empty inbox, growing as mail or panels arrive.
- Refreshed toolbar icon set.
| Popup | Settings · MyGmail | Settings · Autofill & Inbox |
|---|---|---|
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 |
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| Address, identity, live inbox with OTP chip | MyGmail: API key, alias & dot-variant toggles | Autofill, identity, notification preferences |
Works in Chrome and Brave (Manifest V3). No build step, no dependencies.
git clone https://github.com/nullstacks/temp-mail-extension.gitThen open chrome://extensions (or brave://extensions) → enable Developer mode → Load unpacked → select the cloned folder.
Prefer a zip? Download the .zip attached to the latest release, unzip, and load that folder instead.
📖 Full walkthrough — including updating, uninstalling and troubleshooting: INSTALL.md
Optional provider — the default Catchmail/temp.tf flow needs no account and no keys.
- Create an account at mailapi.pushkarsingh4343.workers.dev and link your Gmail there. Gmail delivers
you+anything@gmail.comandy.o.u@gmail.comto your normal inbox; MailAPI filters the mailbox per address, so each signup address only shows its own mail. - In the extension: Settings → MyGmail → paste the API key and the same Gmail address, then press Test connection.
- Pick the address style: + alias (
you+k3x9qm2@gmail.com), dot variant (y.ou@gmail.com), or both. Both off uses your plain address and shows your whole inbox. - Press New for a freshly randomised address.
Notes: access to the MailAPI host is requested the first time you pick MyGmail (optional permission — other providers never need it). The API key is stored in chrome.storage.local on this browser only. Polling is cheap: an ids-only request each check, and a message is downloaded once, only when it is new. Each saved address remembers its provider, so a @gmail.com address from temp.tf and one from MyGmail are never confused.
| Providers | Catchmail's open API (api.catchmail.io): any address works instantly on Catchmail domains — or point your own domain's MX at smtp.catchmail.io for a private inbox. temp.tf gives Gmail/Outlook/Hotmail-style addresses with dot & plus aliases. MyGmail serves filtered +alias/dot variants of your own Gmail through your MailAPI account. |
| Automation | An MV3 service worker polls the inbox (default ≈5 s), raises the unread badge and fires desktop notifications. The popup reuses the shared result instead of making its own requests. Pause (⏸) clears the alarm and stops all timers until you resume. |
| Autofill | A content script watches for email fields and injects the always-visible mini icon; Shift+click fills the entire form, dropdowns and radios included. Shortcuts: Alt+Shift+F (autofill), Alt+Shift+M (open popup). |
| Viewer | Message HTML renders inside a sandboxed iframe; remote images stay blocked until you press Load. |
Performance notes (1.5.1)
- Catchmail polling: the message list is fetched each poll, but full bodies are fetched only once per message (newest first, 3 per poll) and cached — previously every poll re-downloaded every message. All Catchmail calls are spaced ≥1.05 s apart to respect the 1 req/s limit. Bodies not yet fetched are loaded on demand when you open the message.
- One poller: the service worker polls; the popup reads the shared result and live-updates from storage instead of making its own requests. Concurrent refreshes share a single request.
- Storage: the inbox is rewritten only when it changes; an unchanged poll writes a ~100-byte record. Settings are cached in memory.
- Backoff / idle: fast polling backs off exponentially on errors and stops after 10 min with no new mail (the 30 s alarm continues); opening the popup or receiving mail resumes it. Pausing clears the alarm entirely — no wake-ups at all.
- Content script: no work until an email field exists; only fields inside the viewport are measured (IntersectionObserver); DOM changes are scanned incrementally (added nodes only); layout reads/writes are batched; no timers run while no email field is on screen; tiny iframes are skipped; turning the icon off detaches everything.
- MyGmail: an ids-only request each check; a message is downloaded once, only when it is new.
- Everything (address, inbox, history, settings) is stored locally in your browser
- No analytics, no trackers, no telemetry, no third-party requests beyond the mail providers you pick
- Catchmail mailboxes are anonymous and create-only; custom domains stay private (unreadable to others)
- MyGmail: the API key never leaves this browser's
chrome.storage.local; mail flows through your own MailAPI account - Fake identities are randomly generated — for testing and privacy only, never for impersonation
Issues and PRs welcome — open an issue or fork and send a pull request. For bugs, include your Chrome/Brave version and the affected provider.