Integrating countdown timers in emails can be done using several methods: 1. HTML and CSS: You can create simple countdown timers using HTML and CSS code. 2. Specialized Tools: There are email marketing platforms and third-party tools that offer built-in countdown timer functionality, making it easier to add timers without technical expertise. 3. GIFs and Images: Pre-made GIFs and images can be used for a less dynamic but still effective countdown timer.