Email validation with Mailgun's API [PHP]

I wrote this quick email validation class using Mailgun's API like a month ago. You can get it on github here: github.com/kehers/MG_Email. You will need a public API key from Mailgun though. Simply signup to get one.

What makes it interesting are the checks:

• Syntax checks (RFC defined grammar)
• DNS validation
• Spell checks (gives you a did you mean suggestion)
• Email Service Provider (ESP) specific local-part grammar (if available).

Usage is simple:

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<?php
include_once 'MG_Email.php';
$mailgun_public_api_key = 'your_mailgun_public_key';
$mg_email = new MG_Email($mailgun_public_api_key);

$email = 'someemail@yhoo.com';
if ($mg_email->is_valid($email)) {
    echo $email.' is valid';
}
else {
    echo $email.' is invalid.';
    if ($mg_email->spell_check)
        echo ' Do you mean '.$mg_email->spell_check.'?';
}
?>