Setting an expiry date is crucial for several reasons: 1. Creates Urgency: An expiration date creates a sense of urgency, prompting recipients to act quickly. 2. Boosts Engagement: Time-bound offers can significantly increase engagement rates and motivate recipients to make a purchase or take the desired action. 3. Inventory Management: For businesses with limited stock, setting an expiration date helps in managing inventory effectively. 4. Campaign Effectiveness: It helps in measuring the campaign's effectiveness over a specific period.