Important: If you have an error or white screen after updating Elementor, please see here for the solution: http://bit.ly/2KRhmLQ

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Reducing Spam

If you are referring to Formidable there is a great article for reducing spam emails that come from the forms.

https://formidablepro.com/knowledgebase/add-spam-protection/

If it's from the Booked Plugin, then just install Really Simple Captcha and activate it. 

https://wordpress.org/plugins/really-simple-captcha/

If this is from WP Booking System, make sure you have Captcha enabled under WP Booking / Forms /

Cheers!