Email domain spelling suggester
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A jQuery plugin that suggests a right domain when your users misspell it in an email address.

What does it do?

When your user types in "user@hotnail.con", Mailcheck will suggest "".

At Kicksend, we use Mailcheck to help reduce typos in email addresses during sign ups.


See it live in action here.


  • For instant use, download src/jquery.mailcheck.min.js into javascripts directory. Use src/jquery.mailcheck.js if you want to hack on it, or you are using your own minimizer.

  • For hacking, fork the repo or git clone it.


First, include jQuery and Mailcheck into the page.

<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="jquery.mailcheck.min.js"></script>

Have a text field.

<input id="email" name="email" type="text" />

Now, attach Mailcheck to the text field. Remember to declare an array of domains you want to check against.

<script type="text/javascript">
  var domains = ['', '', ''];

  $('input#email').mailcheck(domains, {
    suggested: function(element, suggestion) {
      // callback code
    empty: function(element) {
      // callback code

Mailcheck takes in two callbacks, suggested and empty. We recommend you supply both.

suggested is called when there's a suggestion. Mailcheck passes in the target element and the suggestion. The suggestion is an object with the following members:

  address: 'test',          // the address; part before the @ sign
  domain: '',    // the suggested domain
  full: ''  // the full suggested email

empty is called when there's no suggestion. Mailcheck just passes in the target element.

You can use the callbacks to display the appropriate visual feedback to the user.


The Mailcheck jQuery plugin wraps Kicksend.mailcheck. The prime candidates for customization are the methods Kicksend.mailcheck.findClosestDomain and Kicksend.mailcheck.stringDistance.

Mailcheck currently uses the sift3 string similarity algorithm by Siderite.

Since Mailcheck is a client-side operation, keep in mind file size, memory usage, and performance.


Mailcheck is tested with Jasmine. Load spec/spec_runner.html in your browser to run the tests.


Derrick Ko (@derrickko)


Copyright (c) 2012 Receivd, Inc.

Licensed under the MIT License.