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This test tracks the flow of messages through an Exchange organization, and reports the number and size of messages that pertain to every key event type handled by the Exchange server. These types include the following:

Type	Description
SEND	A message sent by Simple Mail Transfer Protocol (SMTP) to a different server.
RECEIVE	A message received and committed to the database.
SUBMIT	A message submitted by an Exchange 2007/2010 computer that has the Mailbox server role installed to an Exchange 2007/2010 computer that has the Hub Transport server role or Edge Transport server role installed.
POISON	A message added to the poison message queue or removed from the poison message queue.
FAIL	Message delivery failed

Whenever a user complaints of not being able to send or receive mails, the metrics reported by this test and the detailed diagnosis information provided therein will enable administrators to accurately determine the current status of the email sent by the user.

If need be, administrators can configure this test to additionally report the total number of messages on the Exchange 2007/2010 server and their total size, regardless of event type. Apart from the event types discussed above, this total will also include messages that belong to the following event types:

Type	Description
BADMAIL	A message submitted by the Pickup directory or the Replay directory that cannot be delivered or returned
DELIVER	A message delivered to a mailbox
DEFER	A message for which delivery was delayed
DSN	A message for which a delivery status notification (DSN) was generated
EXPAND	A distribution group was expanded
FAIL	Message delivery failed
REDIRECT	A message redirected to an alternative recipient after an Active Directory directory service lookup
RESOLVE	A message for which recipients were resolved to a different e-mail address after an Active Directory lookup
TRANSFER	Recipients were moved to a forked message because of content conversion, message recipient limits, or agents

Exchange administrators can use this total to accurately assess the overall message traffic on the server and the ability of the server to handle the inflow/outflow of messages.

Measurement	Description	Measurement Unit	Interpretation
Number_of_emails	Indicates the number of emails of this event type detected during this measurement period.	Number	By default, this measure provides detailed diagnosis for the FAIL and POISON messages only. Using the detailed diagnosis of these descriptors, you can view the complete details of the failed and poison messages. Optionally, users can turn on detailed diagnosis generation for the RECEIVE, SEND, and SUBMIT messages as well, so as to view the complete details of such messages. The All descriptor, even if displayed, will not provide detailed diagnosis information.
Total_Mbytes	Indicates the total size of messages of this event type, during the last measurement period.	MB	Since the value of this measure includes the size of attachments, an unusually high value could indicate that one/more messages carry large attachments. A high value could also indicate the availability of a large number of messages of a particular type.
Inter_email	Indicates the total number of email messages of this event type sent/received within the organization during the last measurement period.	Number	This measure is applicable only for SEND and RECEIVE event types.
Inter_email_size	Indicates the total size of email messages of this event type sent/received within the organization during the last measurement period.	MB	This measure is applicable only for SEND and RECEIVE event types.
Exter_email	Indicates the total number of messages of this event type sent/received from an external domain during the last measurement period.	Number	This measure is applicable only for SEND and RECEIVE event types.
Exter_email_size	Indicates the total size of messages of this event type sent/received from an external domain during the last measurement period.	MB	This measure is applicable only for SEND and RECEIVE event types.