Serge Fonville: > >> I *think* the short, correct answer is to use a policy server: > >> http://www.postfix.org/SMTPD_POLICY_README.html > > I will look into those then > I read into http://www.postfix.org/SMTPD_POLICY_README.html, but I do > not see how I can use this to solve my problem. > Perhaps I am missing something... > > Any help is greatly appreciated
The policy server can reject mail from a remote network with a local sender address. Isn't that what you want? As an added bonus, it can also reject mail from a local network with a remote sender address. This can help to stop outbound spam from zombie-infested PCs. Wietse