Lastmod_date (for orgs), Mail_flow, Max_message_size – Google Message Security Batch Reference Guide User Manual
Page 59: Message_encryption (for orgs), Message_encryption_criteria

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lastmod_date (for orgs)
The lastmod_date (for orgs) field holds the date the organization was last
modified.
Syntax and Example:
lastmod_date=
lastmod_date 1145962000
mail_flow
The mail_flow field turns on or off the inbound and outbound archiving.
Syntax and Example:
mail_flow=
archive_settings modify org=Jumbo ABC, archive_enable=on,
mail_flow=on, journaling=on
max_message_size
The max_message_size field holds the organization-level maximum size of
inbound attachments-per-message that users can receive.
Syntax and Example:
max_message_size=<1 - 300 (MB) | NULL (200M)>
modifyorg sales, max_message_size=20
message_encryption (for orgs)
The message_encryption (for orgs) field enables outbound organization-level
messages to be encrypted and sent to a secure portal.
This is applicable to the Google Message Security, Google Message Discovery,
and Google Message Filtering products only.
Syntax and Example:
message_encryption=
modifyorg sales, message_encryption=on
message_encryption_criteria
The message_encryption_criteria field holds a header or subject string identifying
outbound organization-level messages that need to be encrypted.