Keep it Short: The snippet should be concise, typically around 50-100 characters. Be Descriptive: Provide a clear idea of what the email is about. Use Action Words: Encourage the reader to take action, such as "Discover," "Learn," or "Unlock." Avoid Repetition: Don't repeat the subject line; add more context or value. Test and Optimize: Use A/B testing to find what works best for your audience.