MailChecker

Cross-language email validation. Backed by a database of over 55 000 throwable email domains.

• Validate the format of your email (uses validator.js email regex underneath and FILTER_VALIDATE_EMAIL for PHP)
• Validate if the email is not a temporary mail (yopmail-like..., add your own dataset to list.txt)

This will be very helpful when you have to contact your users and you want to avoid errors causing lack of communication or want to block "spamboxes".

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Sponsors

France-Nuage Sovereign French cloud for your signup pipeline. No vendor lock-in.	Hook0 Send signup events as signed webhooks. Self-hosted, retry built-in.	Natalia Catch the leads that signed up with bad emails — Natalia calls them back.	Netir Hire vetted French freelance backend devs through mentored marketplace.
NoBullshitConseil No-bullshit tech advisory. Founders & CTOs get straight answers.	Qualneo Qualiopi LMS for French trainers. 32 indicators wired in, audit-ready.	Recapro Private AI that transcribes meetings & drafts reports. Sovereign hosting.

Interested in sponsoring? Get in touch

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Upgrade

From 3.x to 4.x

• PHP

# import using the fully qualified name.
use Fgribreau\MailChecker;

// ...
echo MailChecker::isValid('[email protected]');

From 1.x to 3.x

Mailchecker public API has been normalized, here are the changes:

• NodeJS/JavaScript: MailChecker(email) -> MailChecker.isValid(email)
• PHP: MailChecker($email) -> MailChecker::isValid($email)
• Python

import MailChecker
m = MailChecker.MailChecker()
if not m.is_valid('[email protected]'):
  # ...

became:

import MailChecker
if not MailChecker.is_valid('[email protected]'):
  # ...

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MailChecker currently supports:

• NodeJS (CommonJS, Instructions)
• JavaScript (Client-Side, Instructions)
• PHP (Instructions)
• Python (Instructions)
• Ruby (Instructions)
• Rust (Instructions)
• Elixir (Instructions)
• Clojure (Instructions)
• Go (Instructions)
• Easily add support for your own language with MailChecker template system and send us a pull-request!

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Usage

NodeJS

var MailChecker = require('mailchecker');

if(!MailChecker.isValid('[email protected]')){
  console.error('O RLY !');
  process.exit(1);
}

if(!MailChecker.isValid('myemail.com')){
  console.error('O RLY !');
  process.exit(1);
}