On 14.5.2012 11.13, Alexander Dalloz wrote: > You are best served if you use a milter. You may find a better suiting > milter onhttps://www.milter.org/, but I think there is no better > flexible choice than MIMEDefanghttp://www.mimedefang.org/ (available > through EPEL). If you speak Perl, you are able to implement what you > describe and even more. Regrettably, my Perl skill is really elementary. But maybe there are recipes on the net. - Jussi