A message consists of a payload and metadata.

Message metadata includes message name (file name), size of the file (that is the size of the payload), payload type (inline storage or shared file system storage), and depending on the payload type, the payload itself (inline) or a payload reference identifier. The metadata is stored in Cassandra. The payload is an actual business document or file. A message can have only one payload.

In Global Mailbox, you can configure a threshold for payload size. If the size of the payload is more than the threshold, the payload is stored in a shared file system storage. If the size is less than the threshold size, it is stored inline with the metadata in Cassandra, as a blob.

Message replication is the replication of both the message metadata and the message payload. Cassandra handles the metadata replication transparently. If the payload of a message is inline, replication of payload is handled by Cassandra. If the payload is not inline, its replication is performed by a replication server.

Global Mailbox administrators can manage messages from the Mailbox Explorer page. Global Mailbox administrators can delete messages or view all messages that a specific Global Mailbox contains.