Thank you for reaching out to the Constant Contact Community. It's my pleasure to assist you today.
That's a great question. You are billed based on unique email addresses within the account. That means that any email address can be on as many lists as you want them to be but you are only billed for it once. If you have more questions about How Billing Works please feel free to reach out.
Thank you for choosing Constant Contact. Have a great day!
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