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Email Validator

Check any address for syntax, typos and risk.

Email Validator Tools Reviews Free · no sign-up

Quick Tool Overview

The Email Validator checks any address for RFC 5322 syntax, the 64 and 254 character limits, disposable domains, role accounts and likely typos, then scores it out of 100 with every finding explained.

What it does
Validates an email address and scores how much to trust it
You give it
One address, or a whole list
You get back
A verdict, a score out of 100 and an itemised check list
Cannot tell you
Whether the mailbox exists — that needs an SMTP check
Best for
Checking a signup before it reaches your list
Email Validator Tools Free, unlimited use No sign-up Runs in your browser

About the Email Validator

Paste an address and get the whole picture at once: whether it is well-formed under RFC 5322, whether it fits the 64-character local part and 254-character total limits, whether the domain is a known throwaway provider, whether the mailbox is a role account nobody reads, and whether the domain looks like a misspelling of a real one.

Each finding comes with the reason behind it, not just a red or green light, so you can tell the difference between an address that is broken and one that is merely worth a second look. The result ends in a quality score out of 100 and a plain verdict — valid, risky or invalid — which is what you actually need when you are deciding whether to keep a signup.

It does not claim the mailbox exists, because nothing that runs in a browser can know that. What it does catch is the large majority of bad addresses on a real list, which are typos and junk rather than mailboxes that quietly closed.

Key features of the Email Validator

Full RFC syntax check

Local part, domain, labels, quoting and every length limit.

Risk signals included

Disposable domains, role accounts, reserved domains and typos.

Typo corrections

A misspelled domain comes back with the address it should have been.

Every finding explained

The reason behind each result, not just a red or green light.

Runs in your browser

No upload, no per-address charge and no limit.

How to use the Email Validator

  1. 1

    Paste an address

    One address, or a whole list — every line is checked separately.

  2. 2

    Read the verdict

    Valid, risky or invalid, with a score out of 100 beside it.

  3. 3

    Work through the checks

    Each row says what was tested and what was found.

  4. 4

    Act on the suggestion

    If a domain looks like a typo, the corrected address is offered.

Frequently asked questions

No, and any free tool claiming otherwise is guessing. Proving a mailbox exists needs a DNS lookup and an SMTP conversation with the receiving server, neither of which a browser can make. This checks everything that can be decided from the address itself — which is most of what goes wrong on a real list.

Reviews of the Email Validator

What people who use the Email Validator think of it. Reviews come from visitors and are posted as written.

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