Log futurerelease MTA option

Transaction logging MTA options:  (0-3)
(New in 8.0.) The  MTA option controls whether or not any  SMTP FUTURERELEASE value is included in  MTA message transaction log entries and/or   mapping table probes. Setting bit 0 (value 1) causes the future release value, expressed as an offset in seconds from the current time, to be logged immediately after the mailbox UID is logged, before the Sieve filter information. A " " attribute is used in the XML log format. If bit 1 (value 2) is set in the  MTA option,  then this information appears in the    mapping table probe immediately after the  mailbox UID, before the  Sieve filter information.

See also:
 * Transaction logging MTA options
 * MTA transaction logging
 * Triggering effects from transaction logging with LOG_ACTION
 * log_format MTA Option