Campaign Signup Notifications

Any tips/tricks to get email notifications when a new subscriber signs up for an email list?! 

I set up a Google Sheet for my client that compiles all of her signups for her newsletter into one Sheet and had her sign up for the notifications in Sheet to notify her when there is an edit (addition). But she hates it. I know it’s not the best way, but all I could come up with. I wish Squarespace would add this feature! 

Please let me know if there’s a better way. 😩

Did you ever figure this out? I'm trying to figure it out as well.