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Thank you for coming to the Community with this inquiry. While there is an option to be notified when contacts subscribe or unsubscribe from your account, there is no way to be notified if they sign up for a specific list. It's a great idea and I can see how it would be useful. I will forward your feedback to our developers for review, though I apologize for any inconvenience not having the feature currently may cause.
Thank you for reaching out to us! Currently, the signup and unsubscribe updates can only be turned on for the whole account, not for specific lists. It looks like your account already has it turned on to receive daily updates for the new sign ups and the unsubscribes. I will definitely track your feedback and let our developers know that updates on specific lists are something you would like! Let us know if you have any other questions!