Spool fields, Auto_unspool, Despool_max_connections – Google Message Security Batch Reference Guide User Manual
Page 77: Duration, Org (for spooling)

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Spool Fields
These fields are applicable to the Google Message Security, Google Message
Discovery, and Google Message Filtering products only.
auto_unspool
The auto_unspool field is the on/off switch for automatically delivering spooled
messages.
Syntax and Example:
auto_unspool=<off/0 | on/1>
auto_unspool ’0’
despool_max_connections
The despool_max_connections field holds the maximum number of dedicated
connections which will deliver your spooled mail when an outage is complete. This
is the Unspooling Connection Rate.
Syntax and Example:
despool_max_connections=<number of dedicated connections string>
despool_max_connections 5
duration
The duration field holds the amount of time since spooling was last activated, or
the amount of time that spooling has been activated.
Syntax and Example:
duration=<duration time in seconds >
duration 1800
org (for spooling)
The org (for spooling) field holds the name of the email config organization
managed by Spool Manager.
Syntax and Example:
org=<email config name>
org jumboemailconfig