4.6.5 Sending the Message

The client examines the locked e–mail message, performs any required processing (for example, it determines whether there are any recipients (1) that the server cannot deliver to), and creates a copy of the message to be delivered in the folder just retrieved by using the RopCreateMessage ROP request ([MS-OXCROPS] section

The client then sends a RopTransportSend ROP request ([MS-OXCROPS] section to have the server send the message.