A dunning letter is a formal written notice that finance organizations send to their customers requesting payment on overdue invoices. These payment reminder letters typically escalate in tone and urgency over time, as accounts become more delinquent. Dunning letters are critical steps within larger accounts receivable collections procedures. However, modern AR teams are moving away from static, one-size-fits-all letters in favor of personalized, prioritized outreach. Agentic AI can be used to support modern dunning letter procedures. With the help of AI, outreach is prioritized based on real-time financial risk profiles, and the tone, timing, and communication channel are tailored based on data-backed best practices to increase debtor responsiveness.