A messaging server application system handles message creation, receipt, and response for any sort of digitizable message in any format. It typically operates as a core application and application infrastructure in a communications network or networks in the multiple sender, receiver and user modes of the same or varying design and operational characteristics. The system uses an application architecture organized using a set of ten loosely-coupled subsystems falling into three general functional groups: interface/connector subsystems, core subsystems, and storage subsystems. The interface/connector subsystems include Voice, Data and Multimedia Gateways as well as Message Connectors and aMultimodal Authenticator. The core subsystems include a Multimedia Messaging Bus, an independent Metadata Messaging Bus, and a Content Transformer. The Storage Subsystem can include various Storage Subsystems. The core subsystems extract message metadata and combine this metadata with information about the delivery and routing of the message to form a "Metamessage".