Direct link
Each InboxSys received campaign has an ID. This ID is not visible in a message list. Here is how to find the real InboxSys message ID.
To see the message ID, open the message in question an click on the - symbol in the menu bar above the message. You can now see the ID, right on top. To compile a direct link, take the base URL of the campaign (in most cases that is app.inboxsys.com/overview.php) and add the message ID as GET parameter. The name of the parameter is hid. Example:
https://app.inboxsys.com/overview.php?hid=123456789