BoltMail
Error message returned by the "Web-form"
The application has a special custom field/variable that can be used to display error to your contacts when they encountered errors while using your "Web-Forms".

For internal error pages that gets stored in the application internally, you can use the custom field  %%GLOBAL_Errors%% in order to display these error messages to your contact...

For external error pages where you "use existing URL" for your error pages, the application passes a special variable in the URL called "Errors".

An example of an external error page code:
============================================================================
<html>
<head><title>Error has occurred</title></head>
<body>
The following error has been returned: <?php print $_GET['Errors']; ?>
</body>
</html>
============================================================================