GET /pagename?chronoform=formname&event=submit HTTP/1.1" 200 12144 "-" "Mozilla/5.0 (compatible; SemrushBot/3~bl; +http://www.semrush.com/bot.html)
You still need server side checks.
You also need to check the recaptcha has been done properly, with the check recaptcha action or using the automatic check.
Try to access that url directly yourself, does it work ?
If I directly access the URL with the aforementioned GET parameters an empty Mail will be sent.
2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by ChronoEngine.com