include('EmailAddressValidator.php');
 
$validator = new EmailAddressValidator;
if ($validator->check_email_address('[email protected]')) {
    // Email address is technically valid
}
else {
    // Email not valid
}

http://code.google.com/p/php-email-address-validation/

Checks for a valid email address using the php-email-address-validation class.
Source and docs = URL

Email address check

email, validation

PHP