| 摘要 |
A client computer sends an extended simple mail transfer protocol extended hello command to a server computer. In response, the server computer sends an advertisement to the client computer to identify a capability to receive message context information. The client computer, in turn, analyzes the capability advertisement to determine if it has any blobs associated with the capability identified in the capability advertisement to send. If the client computer has one or more blobs to send, the client computer sends a parameter in a MAIL command to the server computer specifying that the client computer will utilize the capability identified in the capability advertisement and specifying an order in which to expect the blobs if the client computer intends to send more than one blob. The client computer sends the blob(s) to the server computer after receiving an indication that the server computer is ready to receive the blob(s).
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