Query: Sum of emails of instances with more than 20 emails on them

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SELECT SUM(cnt) FROM (
	SELECT COUNT(*) as cnt FROM "_messageToInstance"
	JOIN messages
	ON messages.id = "_messageToInstance"."messageId"
	JOIN "instances"
	ON instances.id = "_messageToInstance"."instanceId"
	WHERE messages.type = 'email'
	GROUP BY "instanceId"
	HAVING COUNT(*) > 20
) as x