Squarespace customers should always go directly to www.squarespace.com and sign into their accounts from there. If there is something that they need to do, they will be notified after signing in.
A "Squarespace Your Site is Expiring" Scam
On Fri, Oct 26, 2018 at 12:57 PM
Your site is expiring.
We were unable to authorize your credit card payment for your website.
To keep your site online, please update your billing information in the Billing panel in the next three days. If you don’t update your billing information with a valid credit card within this time, we’ll have to suspend your site. Once you pay your invoice your site will be reactivated.
UPDATE MY BILLING
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Squarespace customers who have already been scammed are asked to contact Squarespace for help.