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READ THIS FIRST
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---------------
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If you try to build with 'make' without editing the makefile for sa-exim to
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see the exim source, and if you haven't patched your exim source with
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localscan_dlopen.patch, sa-exim will not build.
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This is normal, see the BUILDING section below
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This version of sa-exim now requires at least exim 4.11
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BUILDING
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--------
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The code can be compiled in two ways:
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0) Do not set LOCAL_SCAN_HAS_OPTIONS=yes in exim's Makefile. Leave the
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   default which is disabled.
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1) Unpack exim 4.11 or better, and overwrite src/local_scan.c with
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   sa-exim.c.
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   In the sa-exim distribution directory, type make sa-exim.h, and copy
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   it in the same place than sa-exim.c.
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   Rebuild exim, and you're done.
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   Note that if you do this, you are responsible for modifying variables
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   in sa-exim.c that would normally have been modified by the Makefile.
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   This method might seem simpler, but it requires that you rebuild exim every
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   time you upgrade sa-exim.
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2) The better solution is to patch exim with localscan_dlopen.patch originally
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   from David Woodhouse (provided in this archive), and rebuild exim.
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   Here are details on how to patch exim if yours needs it (at least debian's
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   exim4 is prepatched, yours may be too).
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   Choose the patch for your exim version (Philip included the portion that
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   sets LOCAL_SCAN_ABI_VERSION_MAJOR and LOCAL_SCAN_ABI_VERSION_MINOR in exim
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   4.20)
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   - localscan_dlopen_exim_4.20_or_better.patch
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   - localscan_dlopen_up_to_4.14.patch
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   What you gain from doing this is that sa-exim, or another local_scan module
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   can be plugged into exim without rebuilding exim itself (here too you need
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   exim 4.11 or better)
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   To build, you can edit EXIM_SRC in the Makefile and build sa-exim-x.y.so,
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   or I have also recently modified the build environment so that you can
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   now build sa-exim without having the exim sources.
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   You can look in eximinc/version to see which source I included. While this
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   should work for the forseable future, the exim local_scan API might change
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   one day and not building against the current exim sources could cause issues
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   (hopefully, at worst it will prevent sa-exim from using better functions in
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   newer versions of the local_scan API).
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   To be really safe, I modified the localscan_dlopen patch to include a
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   minor and major version number for the API. Philip has agreed to including
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   the piece of the patch that says which version of the API exim is using,
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   so it will be obvious in the future whether exim becomes potentially
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   incompatible with an older version of sa-exim. Note that when Philip adds
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   this small portion of the patch, you will have a resulting conflict if
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   you try to apply it again. This is obviously normal, just remove it :-)
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   Once you're done building, you can copy sa-exim-x.y.so and optionally the
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   dummy/test accept.so in /usr/lib/exim4/local_scan/, and add this to your
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   exim4.conf (at the beginning of the file)
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   #local_scan_path = /usr/lib/exim4/local_scan/accept.so
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   local_scan_path = /usr/lib/exim4/local_scan/sa-exim.so
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   If you are a package builder, note that you don't actually have
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   to edit the values in the Makefile, you can override them as such:
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   make SACONF=/etc/mail/sa-exim.conf LDFLAGS="-shared -fPIC"
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The following is mostly obsolete, but left here for info purposes
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-----------------------------------------------------------------
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I would also recommend to edit exim/src/config.h.defaults as such:
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#define STRING_SPRINTF_BUFFER_SIZE 32768
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The default value is a bit too small for some of the strings that we need to
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expand from SA.
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That said, I found out that exim then complaints that the headers
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it tries to add are too big even after I set "uschar buffer[32768];" in
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src/header.c.
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As a result, I haven't quite found out how to deal with more than 8KB worth
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of SpamAssassin headers, but it may not be a huge deal, 8KB headers are too
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long anyway.
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I asked the SA guys not to output such huge headers and I wrote a patch
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to disable one of the "features" that outputs such huge headers.
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See: http://bugzilla.spamassassin.org/showattachment.cgi?attach_id=195
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This is included and turned on by default in Spamassassin 2.40 and later.
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INSTALL
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-------
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Copy sa-exim.conf to /etc/exim4 (or whatever you set SACONF to),
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and make sure to read it and edit the values to suit your environment.
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So that you don't make any mistakes, SAEximRunCond is turned off by default.
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This should force you to scan the docs before potentially shooting yourself
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in the foot :)
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See README for options
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