Whitepapers serve multiple purposes in email marketing: 1. Lead Generation: By offering a whitepaper in exchange for contact information, you can build a list of potential customers. 2. Educational Content: They provide detailed information that educates your audience about your products, services, or industry trends. 3. Authority Building: Publishing well-researched whitepapers helps establish your brand as a thought leader in your industry. 4. Engagement: High-quality content keeps your audience engaged and encourages them to take further action.