After the timeout period, the message is returned to the sender as a failure. The default
value is two days, and is also a time span value, but has the syntax dd.hh:mm:ss. Days are dd,
hours are hh, minutes are mm, and seconds are ss. The valid range for MessageExpiration-
Timeout is 00.00:00:05 to 90.00:00:00.
It is possible to configure the wait time period before the sender receives a delivery status notification
(DSN) by setting the parameter DelayNotificationTimeout . A DSN lets the sender know that a message
has not yet been successfully delivered, but the system will continue to retry sending the message.
The default is 4 hours, and is a time span value. The syntax is dd.hh:mm:ss. Days are dd, hours are hh,
minutes are mm, and seconds are ss. The valid range for DelayNotificationTimeout is 00.00:00:01 to
30.00:00:00. The value should always be greater than the setting in the TransientFailureRetryCount
multiplied by the TransientFailureRetryInterval parameter.
Delayed Fan - out
When a message has multiple recipients with different destinations, Exchange must bifurcate (make copies)
of the message for each distinct destination. Depending on where the bifurcation happens, there may
be considerable bandwidth consumed. For example, a message with 10 different recipients is bifurcated
on the source server.
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