If you are suffering from registration spam and you have tried just about everything to stop it, only allowing WordPress Registration from specific Emails Function might be your solution. I Just got tired of constant Registration spam no matter what plugin I used to stop it Captcha and all nothing work. This is the only thing that worked for me. Hey anyone can get a free Gmail account 🙂
This is the Function which you put in your Theme function.php file:
function is_valid_email_domain($login, $email, $errors ){
$valid_email_domains = array("gmail.com","aol.com");// allowed domains
$valid = false; // sets default validation to false
foreach( $valid_email_domains as $d ){
$d_length = strlen( $d );
$current_email_domain = strtolower( substr( $email, -($d_length), $d_length));
if( $current_email_domain == strtolower($d) ){
$valid = true;
break;
}
}
// Return error message for invalid domains
if( $valid === false ){
$errors->add('domain_whitelist_error',__( '<strong>ERROR</strong>: You can only use Gmail or Aol for registration.' ));
}
}
add_action('register_post', 'is_valid_email_domain',10,3 );
Just add which ever email domain you want to allow at the $valid_email_domains = array( line
Updated 7-13-21: Although it slow spam, those MF still found a way to register, so is not worth it to be honest if you are looking to stop spam registration.
