What is "My Internet ReceiveConnector" named?

Exchange 2007, Two Servers:

1 on domain running Mailbox, Hub Transport, Client Access, Unified Messaging

1 not on domain running Edge

I'm trying to prevent spoof emails from my own domain.

I can't get the following command to accept:

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

It keeps telling me:
Get-ReceiveConnector : The operation could not be performed because object 'My Internet ReceiveConnector' could not be found on domain controller 'localhost'.

Should I be typing "My Internet ReceiveConnector" or should that be replaced with a computer or domain name? I've tried replacing it but can't get anything to accept.

I tried this from both servers' Shells, assuming it should be done on Edge.

Let's say my computer name is abc-edge (full computer name: abc-edge.abc.org)