Email checker and verifierValidators

Email checker. Know before you send.

Type one address and see if the mailbox exists: valid, invalid, catch-all, unknown or disposable. We do not store or log the address. Your agent can check a whole list the same way.

3 providers in the catalog

Live price

reading live price

One email address
you give it
3
providers
per call
billing

Try it now

Run email checker here

Each run costs you nothing and is limited per hour. The results come from public data through looot. Heavier or repeated use belongs on your own looot account.

One address. We do not store or log it.

Each run is free to you and limited per hour. The data is public. Powered by looot. Run it on your own looot account for heavier or repeated use.

Run it from your agent

Copy one prompt, give it to your agent.

Fill in the placeholder, paste it, and the agent runs the same job on your looot account and shows the cost. It can take a whole list, which the box above does not.

  • You give it: one email address.
  • Billed per call, nothing while your agent is idle.
  • The agent shows the price before it calls.
Prompt: Email checker
Use looot to verify these email addresses: [paste addresses, one per line]. 1. Set up https://looot.ai/skill.md. 2. Search the catalog for an email verification endpoint and check its price before you call. 3. Run the cheapest healthy one, one call per address. 4. Return a table of address, verdict and reason, flag catch-all and disposable addresses, and give the total cost.

Give this to your agent
Setup command
set up looot for Email checker - https://looot.ai/free-tools/email-checker/skill.md

What comes back

What your agent gets from email checker

Field names as the providers return them. The exact set varies by endpoint, and your agent reads it from the catalog.

  • verdict: valid, invalid, catch-all, unknown or disposable
  • quality: good, risky or bad
  • the reason behind the verdict
  • free email provider flag
  • role address flag (info@, sales@)
  • a typo fix when the domain looks misspelled

Providers

Who can do this job today

Your agent picks the endpoint. These providers offer one right now, with the live price of their cheapest.

Use it for

What people do with email checker

  • Protect your sender

    Drop invalid addresses before a campaign so bounces do not hurt your domain.

  • Clean a CRM

    Have your agent check every contact and tag the ones that no longer exist.

  • Check a guess

    Test the addresses from the email permutator and keep the one that is valid.

  • Sign-up forms

    Spot disposable inboxes and typos in the addresses people give you.

Set up once

Three steps. Your agent does the rest.

Keep going

More free tools

FAQ

Questions about email checker

Type it in the box at the top of this page. The checker asks the mail server whether the mailbox exists, without sending an email, and shows the verdict with the reason.

Yes. Each check in the box costs you nothing and is limited per hour. For a list, your agent runs the same check from your own looot account at the per-call price shown above.

No. This page does not save or log the address you type. It is sent once to the verification provider through looot to run the check, and only the verdict comes back to your browser.

The domain accepts mail for any address, so the server will not say whether this one mailbox exists. A catch-all address may work or may bounce. Treat it as risky.

None here. Both names describe the same job: asking the mail server whether the mailbox exists before you send. This page covers both.

Some mail servers do not answer clearly, or slow down checks on purpose. Unknown means the server gave no yes or no. Try again later or treat it as risky.

Yes, from your agent. Copy the prompt above and paste your list. The agent makes one call per address and shows the total cost before a big list.

Give your agent the skill.md link from the prompt above. It calls the millionverifier-verify endpoint, or another email verifier from the catalog, with the email field, and reads the verdict from the result.

No. The check talks to the mail server and stops before any message is sent. The owner of the address sees nothing.
For agents
tool
Email checker
category
Validators
input
One email address
output
verdict: valid, invalid, catch-all, unknown or disposable, quality: good, risky or bad, the reason behind the verdict, free email provider flag, role address flag (info@, sales@), a typo fix when the domain looks misspelled
endpoint
millionverifier: millionverifier-verify
endpoint
dropleads: dropleads-email-verifier
endpoint
tomba: tomba-email-verifier
price
per call, read live from the catalog on the web page
web tool
runs live on the page, free to the visitor and limited per hour
schedule
on demand
setup
https://looot.ai/free-tools/email-checker/skill.md
llms.txt
https://looot.ai/llms.txt
updated
2026-10-14
markdown /free-tools/email-checker.md

Run email checker from your own agent.

The box on this page is limited per hour. Start your workspace, top up, and paste the prompt into the agent you already use for lists and repeated runs.

Start your workspace See all free tools