Most of the students and beginners will use MailChimp’s free plan & first plan. And also, it provides unlimited emails. So, there are a lot of IP addresses flagged. That’s why there is a high chance for your email to go to spam. But Squarespace will be used by only premium users and its plan provides only limited Emails. So the Squarespace email campaign’s IP addresses are not much marked as spam or backlisted compared to MailChimp. To know more, check out Squarespace Vs MailChimp.