I have had a couple of complaints recently about the Zen Cart contact form and spam. It's been years since I've had any complaints and thought it was just a one time thing; however, that might not be the case.
At some point, the developers added in a hidden field that took care of the problem but it looks like the spammers have figured out a way around it. The only alternative at the moment is to install the Google Recaptcha (which I hate) found here in the plugins: https://www.zen-cart.com/downloads.php?do=file&id=1455.
I don't suggest uploading the create account form though. Wish it wasn't even in the mod! The template file is named tpl_modules_create_account.php. There's also one for reviews which actually doesn't even make sense to have in the first place!
Let me us if you want it installed since it's not just a straight upload. We charge either a flat fee for one mod or an hourly fee that can cover several mods and / or issues. Just use the handy dandy contact form please for the initial contact.
Author: Delia Wilson Lunsford, Founder & CEO, WizTech, Inc.