Exchange anonymous Relay

Exchange 2007/10 needs a new receice connector created, leave the local network set to default, change remote servers to be just the IP of the device you want to be able to relay. After the connector is created, edit it, remove all checks from authentication boxes, add a check to anonymous on the permission group. Open powershell and run: Get-ReceiveConnector “Anonymous Relay” | Add-ADPermission –User “NT AUTHORITY\ANONYMOUS LOGON” –ExtendedRights “Ms-Exch-SMTP-Accept-Any-Recipient” This assumes you named the relay "anonymous relay"