There is also the possibility to carry out external campaigns that were not sent in the current client, but from other clients in promio.mail system. In order for these campaigns to become visible as statistics under Campaigns > External, the current client must be assigned to this campaign as a client. A maximum of five clients can be created as a chain here. This feature is used mainly in the agency area in order to make complex email campaigns with multiple clients involved available in a central location as statistics.