Re: [exim] System filter length

On Mon, Aug 24, 2009 at 03:54:03PM -0700, Brent Jones wrote:

> I was wondering how long a system filter could get, in terms of lines,
> statements, and actions.
> We have an application which write a new system filter based on new
> rules on where to save mail to, add/remove headers, delivery rules,
> etc.
> Our needs have made the filter get very long, up to 1,000 lines right
> now, with about 100 statement blocks.

Actually, you can set MAX_FILTER_SIZE in the Makefile when Exim is compiled
to set the maximum filter size. It defaults to 1 megabyte.

The compile-time options are documented in doc/OptionLists.txt. We
use Exim filters for various spam filtering and have MAX_FILTER_SIZE
set to 3000000.

This may be way off topic, but speaking of large filter files... Avoid
large numbers of regex matches in user or system filters. If you have
a large number of them, performance to process even a single message
will consume large amount of cpu. It's better to do 100 exact-text
matches than 1 regex match.

--
Dean Brooks
dean@???