How can we stop Spam from Contact Us Page?

We are using ver. 3.6

We are getting spam emails through our contact us page.  When we try to view the IP addresses, they are showing up blank on the ONLINE CUSTOMERS page.

How can we stop this?

Thanks in advance for any help.

There's an option to display CAPTCHA on contact page. :)

How do I get to that page again?  I have not updated it in years :)

Thanks for you help!

It's in settings page under General Settings. :)

I just enabled it but then I got this error:
Input error: k: Format of site key was invalid

Do you know by chance what that means?  I think that was why I didn't have it enabled before?

I signed up for the ReCaptcha on Google :).  Now it is not sending the email out though?  Any suggestions on that?

I have honeypot and recaptcha enabled for client website running on nop 4.10

But this website is still receiving a lot of contactus form spam. Most of the spam mail id's end with mail.ru or .ru

Any way to block contactus from addresses ending with .ru or specific addresses or domains for that matter ?

Thanks,
Varun

I think there are plugins in the marketplace that can block IP addresses (e.g. whole countries).

This may interest you
https://www.nopcommerce.com/en/boards/topic/63152/spam-control-quick-fix