* J4 <ju...@klunky.co.uk>: > >> I know this is off-topic but is there a way for a third party programme > >> to silently drop spam from delivery? > > There are several: MimeDefang, Spamassassin-Milter and amavisd-new come to > > mind. > > > > MimeDefang and Spamassassin-Milter work as MILTERS (see: smtpd_milters or > > MILTER_README in Postfix). > > > > amavisd-new may be integrated either as MILTER or as content_filter or > > smtpd_proxy_filter using either SMTP or LMTP. You probably want amavisd-new > > if > > you also want a content filter to identify and classify other mail content > > categories (virus, banned, spam, undecipherable and, surprise, clean > > messages) <http://www.ijs.si/software/amavisd/README.postfix.html> > > > > p@rick > > > Thank-you for the suggestions. > > I have Dovecot LDA so Sieve might well be a good idea, but I would like > to inform the sender that the Email was dropped as spam, and avoid > backscatter. I don't think I can do this with Sieve/Dovecot LDA.
You probably could with Sieve Rules, but I believe you don't want to if you give it second thought: Notifying senders that their message was spam is considered backscatter by most people I know. Given a spam ratio higher than 95% your server might end up not delivering 95% of the messages, but notifying those senders. If I may suggest a strategy: - Analyze messages while the client sits in the SMTP session - REJECT spam in the SMTP session. Don't let spam hit the discs or you will end up wasting ressources (I/O, computing power etc.) - Do not notify spam senders/recipients/admins > Is MIMEDefang resource hungary, especially when used as a before queue > milter with Postfix? I haven't used MIMEDefang yet. By definition a MILTER runs in the SMTP session and only uses RAM. That's good. IIRC MIMEDefang is Perl. It's probably fast. p@rick -- state of mind Digitale Kommunikation http://www.state-of-mind.de Franziskanerstraße 15 Telefon +49 89 3090 4664 81669 München Telefax +49 89 3090 4666 Amtsgericht München Partnerschaftsregister PR 563
