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The Mailbox Transport Submission service connects to the local mailbox database using RPC to retrieve messages, and submits the messages over SMTP to the Transport service on the local Mailbox server, or on other Mailbox servers. To select the best Transport service (which could be local or on another server) to submit the messages to and to actually forward the messages to the Default Receive Connector on the chosen Transport Service, the Mailbox Transport Submission services relies on Send Connectors. If one/more of these send connectors fail due to errors or operate at a lethargic pace, it is bound to severely impact the selection and submission of emails to the Transport service. If ignored, this will aggravate and adversely impact the timely delivery of mails to the destination mailboxes. To prevent this, administrators should monitor each SMTP send connector used the Mailbox Submission Service and proactively identify those send connectors that are either latent or error-prone. The EExc2013SubSendTest test helps administrators achieve this.

This test monitors every send connector used by the Mailbox Transport Submission service and reports the throughput of and errors encountered by each send connector. This way, the test accurately pinpoints send connectors that could be experiencing processing bottlenecks and the ones that are error-prone.

Measurement	Description	Measurement Unit	Interpretation
Byte_sent_sec	Indicates the rate at which this send connector sends data.	KB/sec	A consistent drop in the value of this measure could indicate a bottleneck when submitting messages. Compare the value of this measure across send connectors to know which connector is slowing down mail submission.
Conn_cur	Indicates the number of outbound connections from this SMTP send connector.	Number	Compare the value of this measure across connectors to identify the busiest connector.
Msg_sent_sec	Indicates the rate at which messages are sent by this send connector.	Msgs/Sec	A consistent decrease in the value of this measure is indicative of a slowdown when submitting messages. To know which send connector is the slowest, compare the value of this measure across connectors.
Con_fail	Indicates the number of connection failures encountered by this send connector.	Number	Ideally, the value of this measure should be 0. A high value indicates serious connection problems, which need to be investigated right away. Compare the value of this measure across connectors to identify the connector with the maximum connection failures.
Dns_err	Indicates the number of DNS errors encountered by this send connector.	Number	Ideally, the value of this measure should be 0. A high value indicates serious issues in name space resolution, which need to be investigated right away. Compare the value of this measure across connectors to identify the connector with the maximum number of DNS errors.
Protocol_err	Indicates the number of protocol errors encountered by this send connector.	Number	Ideally, the value of this measure should be 0. A high value indicates serious protocol issues, which need to be investigated right away. Compare the value of this measure across connectors to identify the connector with the maximum number of protocol errors.
Socket_err	Indicates the number of socket errors encountered by this send connector.	Number	Ideally, the value of this measure should be 0. A high value indicates serious socket issues, which need to be investigated right away. Compare the value of this measure across connectors to identify the connector with the maximum number of socket errors.