3.2.4.9 Delivering Mail to the Server

When a message is delivered to an account on the server by the client, such as a message received from a POP3 server that is set to deliver the message into a folder on the server, it SHOULD send a RopTransportNewMail ROP request ([MS-OXCROPS] section 2.2.7.7) for each mail delivered to inform the server of the new mail so that the server can process new mail.