Use Days Overdue Metric: Always include {days_overdue} in your messages to show payment urgency increases Progressive Escalation: Consider escalating tone and urgency with each email (friendly → firm → final notice) Set Realistic Limits: Balance aggressive collection with relationships; 3-5 emails over 30-60 days is typical Business Hours Send Time: Send overdue emails during business hours (8 AM - 5 PM) for better response rates Include Payment Link: Always add {payment_link} to make payment as easy as possible Bold Important Info: Use <strong> tags to highlight {invoice_number}, {amount_due}, and {days_overdue} Professional Tone First: Start with respectful tone; only escalate if truly needed for collection Offer Payment Plans: Consider mentioning payment plan options to encourage