On Thu, Jul 21, 2011 at 02:33:35PM -0700, Steve Fatula wrote: > So, mail should go from postfix -> lmtp -> dspam -> smtpd on port 10026, > but using some sockets instead of TCP.
That's fine. The layer-4 transport is not important. > So, assuming I have this correct, does this then qualify as the > so called advanced content filter technique Yes. Because you are not doing fork/exec of complex code for each message, the filter is resident and handles multiple messages, hand-off back to Postfix is not via the slow serialized and I/O inefficient: postdrop(1) -> maildrop -> pickup(8) -> cleanup(8) -> incoming path. -- Viktor.