Log smartsend MTA option

Transaction logging MTA options:  (0-3)
(New in MS 8.1.0.1.) The  MTA option controls whether  information about the actions of smartsend callouts  are included in  MTA message transaction log records. The option defaults to 0, meaning that this information isnot logged. Setting bit 0 (value 1) causes smartsend information to be logged just prior to any header from string. The XML/JSON attribute name in XML/JSON format logs (  set to 4 or 5, respectively) is " ". Setting bit 1 (value 2) causes smartsend information to be included in the  mapping table  probe, again just prior to the header from string.

Normally the  attribute only appears in XML or JSON format logs if there is transaction log information to log. However, setting bit 2 (value 4) will cause the attribute to appear unconditionally.

See also:
 * MTA transaction logging
 * Transaction logging MTA options
 * Transaction logging MTA options