There are lots of businesses using `.io` `.ee` `.co` etc that depending on your email use-case would be detrimental to block especially if you're doing any kinds of business or outreach.
> Honest question: Is there any reason to not just blacklist all emails from TLDs that aren't the Big Four (.com, .net, .org, .gov) and country TLDs (eg: .co.uk, .jp, etc.)?