1. High Frequency Emails: Sending emails daily or even multiple times a day. 2. Scarcity and Urgency: Using phrases like "Only 3 left!" or "Offer ends in 24 hours!" 3. Clickbait Titles: Headlines designed to entice high open rates, but often disappoint the reader. 4. Personalization and Retargeting: Highly personalized emails that follow users around the web.