Hello, I use Exchange 2007 and I followed the below procedure to prevent spams from my own domain: http://exchangepedia.com/2008/09/how-to-prevent-annoying-spam-from-your-own-domain.html I obtain the below result when running the shell command: Get-ReceiveConnector “My Internet ReceiveConnector” | Get-ADPermission -user “NT AUTHORITY\Anonymous Logon” | where {$_.ExtendedRights -like “ms-exch-smtp-accept-authoritative-domain-sender”} User : AUTORITE NT\ANONYMOUS LOGON Identity : EDGE01\Default internal receive connector EDGE01 Deny : False AccessRights : {ExtendedRight} ExtendedRights : {ms-Exch-SMTP-Accept-Authoritative-Domain-Sender} IsInherited : False Properties : ChildObjectTypes : InheritedObjectType : InheritanceType : All I would like to know if there is any way to know if ANONYMOUS User in my company are in used. And if a rool back is possible after I Remove-ADPermission by running that command: Get-ReceiveConnector “My Internet ReceiveConnector” | Get-ADPermission -user “NT AUTHORITY\Anonymous Logon” | where {$_.ExtendedRights -like “ms-exch-smtp-accept-authoritative-domain-sender”} | Add-ADPermission Thanks, Graig

Hi, Of course, you can get that permission back after running the above command. To check whether the Anonymous Users are used in the company, you can check the IP address in the Protocol Logging on the Receive Connector. Thanks AllenAllen Song