Prevent creating spam new user in WordPress

gistfile1.txt

// Blacklist woocommerce customer registration
function blacklisted_user( $errors, $sanitized_user_login, $user_email ) {
	// Blacklist email domains
	$blacklist = ['tmomail.net', 'vtext.com', 'txt.att.net'];

	$email_parts = explode( '@', $user_email );

	if ( is_numeric( $email_parts[0] ) ) {
		// If the user email first part is numeric, add an error message
		$errors->add( 'blacklist_error', '<strong>ERROR</strong>: This email is not allowed to register on this site.' );
	} else if ( in_array( $email_parts[1], $blacklist ) ) {
		// If the user email second part is in the blacklist, add an error message
		$errors->add( 'blacklist_error', '<strong>ERROR</strong>: This email is not allowed to register on this site.' );
	}

	return $errors;
}

add_filter( 'registration_errors', 'blacklisted_user', 10, 3 );