I do have a suggestion for that, though it is far from optimal.
If it is just getting way too much, you can add a robots.txt to the root directory of the website banning all search engines from indexing the site, and that will make this forum far, far less attractive to spambots since their spam will not be indexed in search engines and posting here as far as they are concerned will be posting into a black hole.
This does mean that only the site itself will show up on search engines and not the forum, so people will not have an easy time finding this...
It is a possibility to try just for short term, and remove either if it's impact is too large or if it is just decided it is not worth it. Search engines check for a robots.txt every so often and follow it's instructions once they see new ones in it.
If it is just getting way too much, you can add a robots.txt to the root directory of the website banning all search engines from indexing the site, and that will make this forum far, far less attractive to spambots since their spam will not be indexed in search engines and posting here as far as they are concerned will be posting into a black hole.
This does mean that only the site itself will show up on search engines and not the forum, so people will not have an easy time finding this...
It is a possibility to try just for short term, and remove either if it's impact is too large or if it is just decided it is not worth it. Search engines check for a robots.txt every so often and follow it's instructions once they see new ones in it.