I am sending email's from a campaign using internal delivery routing with type set as bulk.
Problem: Deliveries are prepared but not not sent.I am getting following error.
any help is appreciated.
This can happen for multiple reasons. First, check the installation and configuration and ensure they are correctly set up for the instance. If everything looks correct and other deliveries have been successfully sent within the instance, I recommend reaching out to the Campaign support team for a full analysis.