Bug#276124: add sa-exim support

[Magnus Holmgren]

X-SA-Do-Not-Run is not added by SA-Exim; it's something the README suggested 
that the user adds in the ACLs to prevent scanning of some messages. The 
comments in the default config file recommends using ACL variables instead. 
X-SA-Exim-Version and X-SA-Exim-Scanned are always added, but aren't that 
sensitive, and may be useful for debugging. X-SA-Exim-Rcpt-To, 
X-SA-Exim-Mail-From, and X-SA-Exim-Connect-IP are only added if 
SAaddSAEheaderBeforeSA is set to 1 in sa-exim.conf, which it is by default, 
though. They should be removed from all mail, both remote and local, which is 
why I prefer doing it in the system filter. A future sa-exim version will 
likely handle greylisting internally instead of in a SpamAssassin plugin.

exim4 shouldn't have to adapt to various specific packages that depend on it, 
but it isn't too easy for a package like sa-exim to just drop a configuration 
snippet in /etc/exim4/conf.d that will take care of removing the headers. 
system_filter doesn't seem to be used in the default config though, so I 
*could* hijack that mechanism by shipping a filter file and setting 
system_filter to point at it directly after the place I set local_scan_path. 
Very ugly. Perhaps a system_filter.d directory, whose contents would either 
be concatenated into /var/lib/exim4/system_filter.autogenerated, or processed 
sequentially by Exim (patch needed)?

-- 
Magnus Holmgren        holmgren at lysator.liu.se
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