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READ THIS FIRST
---------------
If you try to build with 'make' without editing the makefile for sa-exim to
see the exim source, and if you haven't patched your exim source with 
localscan_dlopen.patch, sa-exim will not build.
This is normal, see the BUILDING section below

This version of sa-exim now requires at least exim 4.11




BUILDING
--------
The code can be compiled in two ways:

0) Do not set LOCAL_SCAN_HAS_OPTIONS=yes in exim's Makefile. Leave the
   default which is disabled.

1) Unpack exim 4.11 or better, and overwrite src/local_scan.c with 
   sa-exim.c. 
   In the sa-exim distribution directory, type make sa-exim.h, and copy
   it in the same place than sa-exim.c.
   Rebuild exim, and you're done.
   Note that if you do this, you are responsible for modifying variables
   in sa-exim.c that would normally have been modified by the Makefile.
   
   This method might seem simpler, but it requires that you rebuild exim every
   time you upgrade sa-exim.

2) The better solution is to patch exim with localscan_dlopen.patch originally
   from David Woodhouse (provided in this archive), and rebuild exim.
   Here are details on how to patch exim if yours needs it (at least debian's
   exim4 is prepatched, yours may be too).
   Choose the patch for your exim version (Philip included the portion that 
   sets LOCAL_SCAN_ABI_VERSION_MAJOR and LOCAL_SCAN_ABI_VERSION_MINOR in exim
   4.20)
   - localscan_dlopen_exim_4.20_or_better.patch
   - localscan_dlopen_up_to_4.14.patch


   What you gain from doing this is that sa-exim, or another local_scan module
   can be plugged into exim without rebuilding exim itself (here too you need
   exim 4.11 or better)

   To build, you can edit EXIM_SRC in the Makefile and build sa-exim-x.y.so,
   or I have also recently modified the build environment so that you can
   now build sa-exim without having the exim sources.
   You can look in eximinc/version to see which source I included. While this
   should work for the forseable future, the exim local_scan API might change
   one day and not building against the current exim sources could cause issues
   (hopefully, at worst it will prevent sa-exim from using better functions in
   newer versions of the local_scan API).
   To be really safe, I modified the localscan_dlopen patch to include a
   minor and major version number for the API. Philip has agreed to including
   the piece of the patch that says which version of the API exim is using,
   so it will be obvious in the future whether exim becomes potentially
   incompatible with an older version of sa-exim. Note that when Philip adds
   this small portion of the patch, you will have a resulting conflict if
   you try to apply it again. This is obviously normal, just remove it :-)

   Once you're done building, you can copy sa-exim-x.y.so and optionally the
   dummy/test accept.so in /usr/lib/exim4/local_scan/, and add this to your
   exim4.conf (at the beginning of the file)
   #local_scan_path = /usr/lib/exim4/local_scan/accept.so
   local_scan_path = /usr/lib/exim4/local_scan/sa-exim.so

   If you are a package builder, note that you don't actually have
   to edit the values in the Makefile, you can override them as such:
   make SACONF=/etc/mail/sa-exim.conf LDFLAGS="-shared -fPIC"


The following is mostly obsolete, but left here for info purposes
-----------------------------------------------------------------
I would also recommend to edit exim/src/config.h.defaults as such:
#define STRING_SPRINTF_BUFFER_SIZE 32768
The default value is a bit too small for some of the strings that we need to
expand from SA.
That said, I found out that exim then complaints that the headers
it tries to add are too big even after I set "uschar buffer[32768];" in
src/header.c.
As a result, I haven't quite found out how to deal with more than 8KB worth
of SpamAssassin headers, but it may not be a huge deal, 8KB headers are too
long anyway. 
I asked the SA guys not to output such huge headers and I wrote a patch
to disable one of the "features" that outputs such huge headers.
See: http://bugzilla.spamassassin.org/showattachment.cgi?attach_id=195
This is included and turned on by default in Spamassassin 2.40 and later.


INSTALL
-------
Copy sa-exim.conf to /etc/exim4 (or whatever you set SACONF to),
and make sure to read it and edit the values to suit your environment.
So that you don't make any mistakes, SAEximRunCond is turned off by default.
This should force you to scan the docs before potentially shooting yourself
in the foot :)

See README for options