For example, among the defaults: Received: from (Sender's computer name) (unknown [Sender's IP address]) Can it be changed to the following common type? Received: from (Mail server hostname) (Mail server hostname [Mail server IP address]) Or Received: from (Mail server hostname) Thank you.
It already is like this in a standard ISPConfig installation. When you send as an authenticated sender the mail will show this header: Received: from mail.yourserver.tld (mail.yourserver.tld [0.0.0.0]) ... So where do you see the header containing the clients hostname?