Code-Snippets-Functions/Execute a function on a child site/Ultimate Member/validate-the-email-address-by-domain-on-registration.txt

function um_validate_email_domain( $args ) {

	// Change allowed email domains here
	$allowed_email_domains = apply_filters( 'um_allowed_email_domains', array(
			'gmail.com',
			'yahoo.com',
			'hotmail.com'
			) );

	// Change error message here
	$message = __( 'You can not use this email domain for registration', 'ultimate-member' );

	if ( isset( $args['user_email'] ) && is_email( $args['user_email'] ) ) {
		$email_domain = array_pop( explode( '@', trim( $args['user_email'] ) ) );
		if ( !in_array( $email_domain, $allowed_email_domains ) ) {
			UM()->form()->add_error( 'user_email', $message );
		}
	}
}
add_action( 'um_submit_form_errors_hook__registration', 'um_validate_email_domain', 20 );