filters are implemented in lka_filter.c. According to cvs log filter.c is removed in 2017 and was probably part of the first filter attempt.
smtpd-filters.7 has never been hooked up to the build. Probably because it needs a little more scrutiny. But most in there can be used. martijn@ On Fri, 2021-03-19 at 07:56 +0100, Harald Dunkel wrote: > Hi folks, > > looking at github there is a file "smtpd-filters.7" and "filter.c" > in smtpd, but apparently they are not used at build or install time. > configure.ac doesn't mention them, either, so I wonder whats the > story here? Have they been forgotten? Obsolete code? > > > Regards > Harri >