Wietse, Hi Thanks for your reply. I recall that I had read about another filtering option available in Postfix which was called smtpd_proxy_filter (if I spell it correctly) and which filtered messages before queuing. So, is there any difference between the so-called method and using Milter? Thanks again.
Kind Regards Ali Majdzadeh Kohbanani 2009/12/1 Wietse Venema <wie...@porcupine.org> > Ali Majdzadeh: > > question concerning what Wietse proposed. Does the usage of milter help? > I > > mean, is the milter architecture considered as a way to kill spam load > > _before_ piping inbound connections to AS/AV content filter daemons? Or, > > Milter is a way to inspect or update message content without making > extra copies of the message. It has some scaling issues 1) it > processes mail before-queue, which some will find a feature and 2) > all requests are handled by one Milter process; the latter may be > addressed by using a third-party multiplexer that spreads requests > across multiple milter process instances. > > As a general rule, the earlier you can block mail, the better. In > some countries, the inbound SMTP session is the only place where > you can block incoming mail, because mail cannot be discarded. > The postscreen program (www.postfix.org/wip.html) takes this a > little further by keeping the bots away from the SMTP server. > > Unfortunately, I can't be of much further help here. 1M users is > a thousand times beyond my first-hand experience, and that was > before SPAM became a problem. > > Wietse >
