Best features
Why choose Reloop's
temp email checker?
Free, no account needed, and backed by a disposable-domain list that refreshes every 24 hours.
100% Free & No limits
This checker is free. It needs no signup and has no credits or expiry.
99.9% accuracy
It checks disposable list, role addresses, and MX records to maximize precision and avoid false positives.
No Account Needed
No API key or account is needed to use the API. It is rate limited per IP.
Real-time sync every 24 hrs
Our disposable-domain list is refreshed every 24 hours to ensure even the latest throwaway domains are caught.
Savings calculator
Calculate what
throwaways cost you
Set your monthly signups, disposable rate, and cost per bad signup to see what throwaway emails cost you.
$0.60
Trial credits, sends, and support time per throwaway account.
Estimated waste
$2,880/ yr($240 / mo)
Who is it for
Where can I use Reloop's
temp email checker?
Anyone who needs to know if an address is real without ever probing the mailbox.
Developers
- Signup protection
- Registration forms
- Auth middleware hooks
- Account creation APIs
- Guest checkout flows
- Profile email updates
- Inbound webhook triage
Fraud & Security
- Free trial gatekeeping
- API credit protection
- Referral fraud defense
- Multi-account blocks
- Promo code validation
- Bot signup mitigation
- Freemium abuse audits
Growth & Marketing
- Product waitlists
- Gated content downloads
- Newsletter subscriptions
- Webinar registrations
- Demo request forms
- Lead qualification
- Pre-campaign list scrubs
Support & Trust
- Payment dispute triage
- Chargeback investigations
- Suspicious user audits
- Customer support tickets
- Admin dashboard lookup
- Abuse incident triage
- Account recovery checks
API integration
Integrate today
in your code
One request tells you if an address is disposable. No API key or account needed.
Body
emailstringrequired- An email address or a bare domain to check (e.g. you@mailinator.com or mailinator.com). We trim and lowercase it before validation.
AI native
Check temp emails
from your AI agent
Connect Claude, Cursor, or any MCP client to Reloop and let your agent catch throwaway addresses on its own.
MCP Server
Connect Reloop to your AI agent. Let Claude, Cursor, or Codex check addresses before they send.
- 1Add to Claude
Open Connectors
In Claude, go to Settings → Connectors and click Add custom connector. On Team and Enterprise plans an owner adds it under Organization settings first.
- 2
Paste the server URL
Name it Reloop and use this URL. Leave the advanced OAuth fields empty; Reloop registers the client automatically.
- 3
Connect
Click Connect, sign in to Reloop and approve the workspace. Then turn Reloop on from the tools menu in any chat.
Developer CLI
Send email from your terminal. Test deliveries and fix configuration without a dashboard.
Reloop CLI
v0.4.2 · Send email from your terminal
$ reloop emails send \
--to user@example.com \
--subject "Welcome to Reloop" \
--json
✓ queued → sent → delivered (78ms)
{ "id": "msg_01jh8q...", "to": "user@example.com", "status": "delivered" }
$ reloop emails send --to dev@company.com █
All tools
Explore all free email
& developer tools
More free utilities for checking deliverability, DNS records, and email authentication before you hit send.
FAQ
Frequently asked questions.
Paste the address into Reloop's free temp email checker. We parse RFC syntax, match the domain against a ~210,000-provider disposable catalogue (including Mailinator, Yopmail, and Temp-Mail), flag role prefixes, and look up MX records. A disposable verdict means the domain is a known throwaway provider. We did not probe the mailbox.
A disposable email address is a mailbox created on demand that anyone can read without signing up, and that usually self-destructs within minutes or hours. People use them to get past signup walls without handing over a real address.
They stop existing. Once the mailbox expires, every message you send to it hard-bounces, and mailbox providers read sustained bounce rates as a sign that you send to bad lists. That reputation damage applies to your whole domain, not just the throwaway recipients.
Not necessarily. Blocking outright at signup is right for free tiers and trials, where throwaway addresses are used to farm accounts. For newsletters or content downloads, flagging and suppressing later is often enough. Some people simply value their privacy.
Disposable matching is a list lookup: the domain is on the catalogue or it isn't. We also classify role prefixes and look up MX records. New temp-mail providers appear constantly, so a clear result means 'not currently known to be disposable.' It is not a guarantee.
No. We never open an SMTP session or check whether the local-part has a mailbox. MX records only show that the domain publishes a mail exchanger.
The address parsed, the domain is not on the disposable list, and it is not a shared role prefix. If MX records were found, mail can theoretically be routed to that domain. It is not proof of delivery.
No. Consumer mailboxes from Gmail, Outlook, Yahoo and similar providers are free, but they are persistent. They are flagged as free providers so you can apply your own policy. They are not treated as throwaway.
The temp email checker is focused on disposable and throwaway detection at signup time (single address, public API, no key). The free email validator adds bulk CSV cleaning (up to 1,000), fuller health scoring, and list export for campaign hygiene. Use this tool to block burners at registration; use the email validator when you need to clean an entire list.
Nothing is written to a database, added to a list, or used for marketing. Request logs may include the domain and verdict. They never include the mailbox name. The tool is free and needs no account.
Yes. Reloop is open-source email infrastructure, so you can run the same validation inside your own signup flow, self-host the whole stack, or use the hosted API.