email spam

hi,
i am dealing with a spam from an e-mail: [email protected]
same email on all my registered companies…
it’s a wordpress plugin but does it have any tool to block emails from contact form?
i don’t want to block from server (including other email accounts…)

how can I block this email from sending requests to owner’s email?

thanks!

https://ww.wp.xz.cn/plugins/business-directory-plugin/