when adding it to that array, then you can have unref clean up recursively:
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A post-mortem examination on 6 August gave the preliminary cause of death as multiple injuries.
If the subject line of the email is irrelevant to customers, they will ignore it multiple times. But, if it keeps repeating, they are intercepted and unsubscribed from your emails. So, send relevant emails for the benefit of the customer. Don't send emails that often only focus on sales, offers and discounts.