Blocking spam account creation and contact us usage has become increasingly important for Zen Cart operators, as bad guy activity has only gone up in the past few years. But how to do it!
The approach I used was to look for particular things which were commonly associated with bad traffic. Account creation attempts with these characteristics error out, and contact us attempts with these characteristics are dropped. The result is Jerkblocker for Zen Cart. It’s available to all my support customers on request.