Similar to the sextortion scam I wrote about back in December 2018 (see https://protectyourwp.com/scammer-email-with-commentary/), there’s currently a scam going about that often comes to you through your website’s contact form, threatening to destroy your site’s online reputation (using your domain name to send spam, posting angry and negative reviews, getting your domain listed as a spam source, etc).
In general, it’s probably safe to ignore these emails. Should these or other scammers actually start attacking you (which is doubtful – they’re just looking to make quick cash by instilling fear, without having to go through the effort of actually ruining your reputation) there are ways to clear your reputation, so best to treat them like the annoying mosquitos that they are.