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Hi @dgdg - there is some discussion about Delivery Modes here: https://experienceleaguecommunities.adobe.com/t5/adobe-campaign-classic-questions/purpose-of-deliver...
Its likely a flag for the Routing to perform certain functions when it processes the delivery send. It seems likely that for Bulk Delivery the send is handled by Campaign and External is where you have to write how the delivery is handled using your own Javascript APIs.
Thanks
Darren