To prevent Spam, it is best to set up Captcha protection.
To set up Captcha on the back-end, go to emailmeform.com > log in to your account > mouse over the form you want to apply Captcha to and click the "Edit" icon > click "Form Settings" > scroll down to "Anti Spam" > select your preferred Captcha setting:
Remember to click "Save Form" upon completion.
This is an example of the form on the front-end with Smart reCaptcha Verification applied:
Please note: If you select "Show Smart reCAPTCHA Verification", it will only show up if there is an actual attempt to spam. This means, if you submit the form two times in a row during testing, only then, you will see the above image show up, because at that point, the Smart reCAPTCHA concludes there is a spam attempt.