SMS Site Address accounts establish communication between sites (such as parent and child sites) to transfer inventory data, discovery records, and status messages to the SMS_SITE share on the destination site.
You specify SMS Site Address accounts for each sender address when you create addresses for other sites. These accounts must have Read, Write, Execute, and Delete permissions on the Sms\Inboxes\Despoolr.box\Receive directory on the destination site server.
Specify a New Site Address Account
Configuring Site Communications
SMS Accounts Configuration Overview