I think SCode is the best solution to fight comment spam for MT
SCode needs GD and GD.pm
install gd, libpng first (ports/graphics/gd, ports/graphics/png)
./configure --with-png when build GD or cd /usr/ports/graphics/gd; make WITH_XPM=yes
to build GD.pm, needs perl 5.6 or higher
wget http://search.cpan.org/CPAN/authors/id/L/LD/LDS/GD-2.30.tar.gz
perl Makefile.PL
make
make test (optional)
make html (optional)
make install
ref.
防制發廣告機器人的檢核碼
Blog comment spam fighting
An easy way to get rid of MT comment spam
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