Milter applications have been written in C, JAVA and Perl, but
this document deals with C applications only. For these, you need
an object library that implements the Sendmail 8 Milter protocol.
Postfix currently does not provide such a library, but Sendmail
does.
On some Linux and *BSD distributions, the Sendmail libmilter
library is installed by default. With this, applications such as
dk-milter
and
sid-milter
build out of the box without requiring any tinkering:
$ gzcat dk-milter-x.y.z.tar.gz | tar xf -
$ cd dk-milter-x.y.z
$ make
[...lots of output omitted...]
On other platforms you have two options:
-
Install the Sendmail libmilter object library and include
files. On Linux systems, libmilter may be provided by the
sendmail-devel package. After installing libmilter, build the
Milter applications as described in the preceding paragraph.
-
Don't install the Sendmail libmilter library, but build the
library from Sendmail source code instead:
$ gzcat sendmail-x.y.z.tar.gz | tar xf -
$ cd sendmail-x.y.z/libmilter
$ make
[...lots of output omitted...]
After building your own libmilter library, follow the installation
instructions in the Milter application source distribution to specify
the location of the libmilter include files and object library.
Typically, these settings are configured in a file named
sid-filter/Makefile.m4 or similar:
APPENDDEF(`confINCDIRS', `-I/some/where/sendmail-x.y.z/include')
APPENDDEF(`confLIBDIRS', `-L/some/where/sendmail-x.y.z/obj.systemtype/libmilter')
Then build the Milter application.
