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Check for an invalid email address by checking availability of MX records before a comment is posted on a WordPress post
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I am using MAMP PRO on a macOS Mojave 10.14.6
Let's assume you have installed WordPress 6.1.1 or newer having PHP 8.x at a location named /wordpress
Type this in the terminal at /wordpress: - we're installing composer.
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === '55ce33d7678c5a611085589f1f3ddf8b3c52d662cd01d4ba75c0ee0459970c2200a51f492d557530c71c15d8dba01eae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
Now we need to install a PHP library from the composer repository called Spatie DNS.
php composer.phar require spatie/dns
In case there isn't a functions.php in your theme like in the latest twentytwentythree theme, then create one at /wordpress/wp-content/themes/twentytwentythree
Type this in functions.php :
require_once 'vendor/autoload.php';
use Spatie\Dns\Dns;
function comment_post_check_MX()
{
$domain = substr(strstr($_POST['email'], '@'), 1);
$dns = new Dns();
$dns->useNameserver('8.8.8.8'); // We're using Google's name servers
$records = $dns->getRecords($domain, DNS_MX);
if (count($records) > 0)
{
$MXOfFirstRecord = $records[0]->target();
if ($MXOfFirstRecord == '')
{
wp_die( __('Error: The mail record for this domain seems to be empty') );
}
}
else
{
wp_die( __("Error: There doesn't seem to be any mail records for this domain") );
}
}
add_action('pre_comment_on_post', 'comment_post_check_MX', 10);
Now, if you type in an invalid email address like somone@somewhere.travel at the blog post at http://wordpress/2023/01/21/hello-world/ (or at your local domain like wordpress.local), your WordPress should return an error message like this one below before even the comment is posted/saved to the database.
