As i understand it, in trusted networks you want to have any ip or ip range that you trust to be reporting correctly the details of the server from which it received the email.
If this is the case, presumably it is good to have the main service provider servers in this list. So if i know that Yahoo always correctly report the ip of the person they receive the email from, i want to trust yahoo servers. Have i understood this correctly? If so, is there a list somewhere of large email service providers which are reliably going to report the ip they receive an email from, along with their various server ip addresses or ip ranges? Thanks Ben
