A client of ours has a review form that is getting heavily spammed.
The form currently utilises mathspamprotector and they are getting 1-2 spam submissions an hour. In a bid to reduce this, I tried implementing invisible field spam protection and the recapcha module. The recapcha module was the worst and at one stage, they were getting around 40 submissions an hour getting through. Because of this, I have reverted back to mathspamprotection and they keep trickling through.
Does anyone have any ideas as to other means of protection I could implement?