Use Email Authentication Protocols: Implement SPF, DKIM, and DMARC to authenticate your emails and protect your domain from being spoofed. Regularly Check Blacklists: Use tools like MXToolbox or MultiRBL to check if your domain is listed on any blacklists. Monitor Bounce Rates: High bounce rates can indicate issues with your email list or domain reputation. Regularly clean your list to remove inactive or invalid email addresses. Track Engagement Metrics: Monitor open rates, click-through rates, and unsubscribe rates to gauge how your subscribers are interacting with your emails.