Was this an email you posted on the website?
They are just trying to do cold sales, automating and sending the same email to hundreds of websites. The service is not necessarily a scam (though often it's also severely overpriced and not the best quality) but yeah they automatically crawl websites looking for any email or contact form that's posted and then bombarding it with email.
Nothing to worry about as it's on the level of any other spam email, you can block the sender and of course don't click on any links or download/open any attached files.
^That is, if found an email you previously posted however. Which is still not ideal and maybe we should look into an email protection script of some kind... though I doubt they're completely fullproof. But they should prevent most email scraping. If it was an email you didn't post or kept private then something is broken higher up.