Blocking Comments from Specific Email Addresses

Hello,

A specific email address has been posting a large number of spam comments on a HubSpot blog page that I oversee. Unfortunately, with HubSpot’s current features, I can only block submissions to the blog comment form based on domain, rather than a specific email address, and because the offending email address is under the gmail domain, I don’t wish to use this option as I’d have to block comments from all gmail users.

Could we get a feature allowing us to block specific email addresses from being able to leave comments on blogs or submit forms?