Google Apps Directory Sync for Postini Services Administration Guide - Manual (Page 54)

Configuration 57
Add Mail List
Click the Add Mail List at the bottom of the page to synchronize one or more
addresses as mailing lists.
Specify the following:
Mailing List Setting Description
Mail list owner The email address of the user who will manage the
mailing list. If this user is not a user in the message
security service, the directory sync utility will add this
user in the specified Mail list owner org.
The mailing list owner address is case sensitive. Match
the same case as the mailing list owner in the
message security service.
Example: [email protected]
Mail list owner org If the mailing list owner does not exist on your LDAP
server, the directory sync utility will add it to this
organization. If the mailing list owner already exists this
field is not used.
Example: Mixateria Special Administrators