Clear communication about expiration is essential. Here are some ways to do it effectively: 1. Subject Line: Mention the expiry date in the subject line to grab immediate attention. Example: "50% Off! Offer Expires in 24 Hours!" 2. Countdown Timers: Use countdown timers in the email body to visually demonstrate the time left. 3. Highlighting Dates: Clearly mention the expiry date within the email content, preferably in bold or highlighted text. 4. Actionable Buttons: Have call-to-action buttons that emphasize urgency, such as "Buy Now Before It’s Gone!".