Given the assumptions, we can calculate the number of customers who would receive emails each day as follows: We have 1,000,000 Email Addressable Customers. 90% of these customers are email targets, so 0.9 * 1,000,000 = 900,000 customers are email targets. These customers are not eligible to receive another email for a lockout period of 8 working days, so they can receive an email again on the 9th working day. Therefore, to have the same/similar number of customers receive emails each day and maximize the number of email sends each day, we would divide the total number of email targets by the number of working days in the lockout period plus one (since they can receive an email again on the 9th working day). So, 900,000 customers / 9 working days = 100,000 customers would receive emails each day