- Opt-in Forms: Use double opt-in forms to ensure subscribers genuinely want to receive your emails. This method involves a two-step process where the subscriber confirms their subscription via a link sent to their email. - Incentives: Offer incentives like discounts, free resources, or exclusive content to encourage sign-ups. - Content Quality: Provide high-quality, valuable content that resonates with your audience to keep them engaged and reduce unsubscribe rates.