Adding a whitelist for URLs on top of the spam blacklist? (6)

2 Name: Anonymous : 2010-08-12 09:26 ID:Heaven [Del]

I'm not really sure how you expect this to work -- you are hopefully aware that the spam list isn't a list of URLs, it's just a list of bits of text to reject. I don't think it is feasible to have a whitelist on top of such a filter.

Suppose you configure the spam filter to block only "http" (right here, you already have a problem, if something's not identified as a URL because they wrote hxxp then it still "works". But let's ignore that for now.) Your theoretical whitelist has the single entry "http://wakaba.c3.cx", presumably to allow posting links to this website.
Now suppose someone tries to post the following text:

blah blah blah I am a stupid spammer
http://www.stupidspamwebsite.com/spam/spam/
oh and by the way http://wakaba.c3.cx/

Your blacklist would find that http in the message and try to reject it. A simple text-matching whitelist would find wakaba.c3.cx and say "it's fine" and now someone just completely evaded your spam list.

I don't know of any sane way to do what I think you're asking for.

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