How to create anonymous relay receive connector on Exchange 2010 ?

My best practice is to create another custom receive connector for anonymous users instead of using the default one, where you can limit by source IP address who will be able to anonymously relay emails. To do so you will have to grant anonymous connections extended right to accept any recipient email address (for example we have created new receive connector "AnoRel") :

Get-ReceiveConnector "AnoRel" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient"

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