>>24982

The best way to make a system inconvenient to spammers is a closed one with registration, login and delay of first post permission. But this is of course nothing wanted on this board.
Something heading into this direction could be a whitelist. Although on an anonymous board a list of names makes no sense, a list of tripcodes could. It wouldn't help to spot spammers in the first place, but it would narrow down the amount of posts that have to be checked for spam by script or ‒ even more important ‒ by hand.
If the users are encouraged to use the (secure) tripcodes and the list grows with the time, an automatic filter can discard known posters from further checks, leaving only resisters and unknown or new posters to be checked and the latters to be added to the list if appropriate.
I don't know how much development time it would take, but i can imagine that the search system of the database program that is storing the posts already has the ability to perform such a task without too much efforts.