How to prevent or block spam?

I have tried EVRYTHING Google has recommend to BLOCK SPAM EMAILS (block sender, block subject and created various filters), but those SPAM EMAILs still getting through.

The ONLY conclusion is that the SPAM EMAILS are coming DIRECTLY from GOOGLE's ADVERTISING/MARKETING.

To prevent spam submissions, please check the following guide: How-to-Add-a-Captcha-Field

Also, you may consider switching a Unique Submission option to 'Check cookies only' or 'Check cookies and IP'.

Another suggestion is to create a hidden field and set a condition that if hidden field is empty then show the submit button. Since bots scans all the fields in the form, they will fill the hidden field and won't be able to proceed.

ex.

Set your condition like this:

I hope this helps. If the issue is with Jotform marketing campaign, I have removed your email from mailing list.

Let us know if you have any questions or if you need further assistance.