[CentOS] dealing with spoofing

Here's a thought I just thunk, folks: some scum, apparently in eastern
Europe, has harvested my email, and is using it in the Reply-To: in its
spamming efforts. Now, I realize that some mails go out from noreply, but
other than that, is there a good reason why a mailserver would not be
configured to send delivery failure to *both* Reply-To and From?

      mark