lorax - 4:16 am on Jul 10, 2013 (gmt 0)
Got it. So bots are submitting form data to the handler even though the field does not exist on the form.
Did you remove the field using a filter? Like so:
You could look for the HTTP Post/Get commands that don't come from your webserver and then redirect them though I haven't thought through how best to execute this without breaking your upgrade path.