Blocking InternalDomain Name Coming from outside with Anonymous Authentication

Exchangepedia.com has an excellent article on HOW TO: Prevent annoying spam from your own domain which can be found at following link

http://exchangepedia.com/blog/2008/09/how-to-prevent-annoying-spam-from-your.html

CMDLET to Prevent spam from your own domain

Get-ReceiveConnector “Incoming Internet Mail” | Get-ADPermission -user “NT AUTHORITY\Anonymous Logon” | where {$_.ExtendedRights -like “ms-exch-smtp-accept-authoritative-domain-sender”} | Remove-ADPermission

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