When you click Start in the Send SmartPost dialog box, you get an error message that says that the message you are about to send exceeds the maximum document size.
This means that your organization has set a maximum size of messages that the SmartPost process can send. The limit is exceeded and therefore the process cannot start. You can try to reduce the size of the message by splitting it in to several messages, or you can contact your local WorkZone responsible to increase the maximum size of messages.
Note for the administrator
You can configure the maximum message size for each dispatcher in WorkZone Configurator. Adjust the MaxCombinedMessageLength (only e-Boks) parameter in the SmartPost process parameters and the MaxDocumentSize parameter for each of the dispatchers, e-Boks, Strålfors, and OneTooX.
See Configure SmartPost and Configure dispatchers in the WorkZone Process Administrator Guide.