add_filter( 'registration_errors', 'tml_block_spam_domains', 10, 3 );
function tml_block_spam_domains( $errors, $sanitized_user_login, $user_email ) {
    // List the specific spam domains you want to block (lowercase only)
    $blocked_domains = array( 
        'cleargarden.net', 
        'morningtrail.net', 
        'valenrisa.com',
		'fmailler.net', 
        'fmaillerbox.net', 
        'fmaillerbox.com', 
        'bravonest.com',
        'greengardenpath.net',
        'telarino.com' // Add any additional spam domains here
    );
    
    // Extract the domain from the submitted email address
    $email_parts = explode( '@', $user_email );
    $domain = end( $email_parts );

    // Check if the domain is in the blacklist
    if ( in_array( strtolower( $domain ), $blocked_domains ) ) {
        $errors->add( 'email_domain_blocked', __( '<strong>ERROR</strong>: Registrations from this email provider are not allowed.' ) );
    }

    return $errors;
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	Comments on: TCN 2019 St. Louis Cardinals Prospect #7 – Ryan Helsley	</title>
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