Hi I just found that someone’ email source ip address is 127.0.0.1 or private ip address. I think this is safe to protect own real ip address when the email is sent out. In order to know how it is done, I check it in internet, and the message that got back to me is that this can be done by a proxy server. So my question is without proxy server, this can be done? --- how is the original ip address replaced with 127.0.0.1 or private ip address when email is sent out ? If through proxy server, the email source ip address is ip address of the proxy instead of 127.0.0.1 or private ip address. Thank you.