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Email verification that tells you why

Every address comes back Deliverable, Risky or Undeliverable, with the reason in plain words. Try it free below.

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simplecold.com / tools / email-checker
Free · 5 checks a day · No sign-up
Six checks, in order
  1. 01Format
  2. 02Mail servers
  3. 03Disposable and role
  4. 04Catch-all
  5. 05Connect
  6. 06Mailbox

Type an address and press Check email. Each check above lights up as it runs, and the result appears here with the reason.

  • Six checks on every address
  • A plain reason with every result
  • Slow servers never cost a second credit
  • 200 free credits, no card

Results

Three results. Every one comes with a reason.

No scores to decode. Each address is Deliverable, Risky or Undeliverable, and the reason says exactly what we found. Slow servers show Processing until the answer arrives.

Deliverable

The mail server confirmed the mailbox exists.

[email protected]The mailbox exists and accepts mail.
What to doSend.
Risky

It may deliver, but we can't promise it.

[email protected]The domain accepts mail for any address, so this mailbox can't be confirmed.
What to doRead the reason, then decide.
Undeliverable

Mail to this address will bounce.

[email protected]Possible typo. Did you mean [email protected]?
What to doRemove it or fix the typo.
Processing

The mail server is slow to answer. We're still asking.

[email protected]Still checking this mailbox.
What to doWait. The final result follows, with no second credit.

What we check

Six checks run on every address

They run in order and stop as soon as an address fails, so you never pay twice for the same answer.

  1. 01

    Syntax

    Is the address written correctly? Catches missing @, spaces and bad characters.

    Learn more
  2. 02

    Typos

    Is it a common misspelling like gmial.com? We suggest the likely fix.

    Learn more
  3. 03

    Disposable and role

    Is it a throwaway inbox, or a shared address like info@ or sales@?

    Learn more
  4. 04

    Domain and MX

    Does the domain exist and have a mail server? Dead and parked domains fail here.

    Learn more
  5. 05

    Catch-all

    Does the domain accept every address? If so, we say so instead of guessing.

    Learn more
  6. 06

    Mailbox

    We ask the mail server whether this exact mailbox exists, without sending an email.

    Learn more

Slow servers

A slow mail server never costs you a second credit

Some servers make unknown senders wait on purpose. You get an answer in about 12 seconds, and the final result follows by itself.

0 s

You click Check

Format, domain, typo, disposable, role and catch-all checks run, then we ask the mail server.

~12 s

You get an answer

If the server is still stalling, you see Processing instead of a guess.

1–2 min

The final result arrives

Usually within a minute or two. Ask again about that address for free for 30 minutes. No second credit.

Ways to verify

However your addresses arrive, verify them the same way

Paste a few, upload a whole file, or check them in your own code. Same six checks, same results.

Paste up to 1,000

Copy addresses from a spreadsheet or a thread and check them as one list.

Paste a list

Upload a CSV

Every original column is kept. We add the category, the reason and the suggested fix to each row.

Upload a file

Use the REST API

Single checks for sign-up forms, batches for small lists, bulk jobs for big files.

Read the API docs

FAQ

Verification questions

How the checks work and what the results mean.

We found the address, but can't promise it will deliver: the domain accepts every address, it's a shared role inbox, it's a throwaway service, or the server wouldn't confirm it. The reason says which.

Still have a question? Talk to us.

Check your list before you send it

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