IT:AD:Google Apps
(UP)
IT:AD:Google Apps:HowTo
change_primary_domain
IT:AD:Google Apps:HowTo:Configure email and aliases
IT:AD:Google Apps:HowTo:Configure Outgoing Email
IT:AD:Google Apps:HowTo:Create an SPF Record for a Domain
See also:
IT:AD:GMail
IT:AD:DropSend