Adding external filtering.

Tortoise allows HighWind style perl filtering.  Tortoise also allows specifying articles that go to the filter with ExternalFilterStringMatch.  Normally all that is required to allow Tortoise to use a filter is the following addition:

binmode(STDIN);

We recommend Cleanfeed, which supports NNTPRelay and Tortoise. If the server is running with a single processor we recommend using article size limits for articles sent to the external filter.  Large articles sent to the filter tend to use a considerable amount of CPU.


1. Install perl onto your news machine. 
2. Find the perl filter you wish to use. (CleanFeed etc...) 
3. Edit filter for per site settings. 
4. In config.txt edit the following entry (of course with relevant paths):
ExternalFilter=c:/perl/bin/perl.exe c:/news/perlfilter.pl 
5. Add pattern for ExternalFilterStringMatch. (This controls what is sent to the filter.)
6. Stop and Start Tortoise. 

