The process of handling delist requests and detecting spam involves automated systems that analyze factors like sender reputation, email content, and recipient engagement. Legitimate emails can be overlooked due to the high volume of requests, aggressive spam filtering, and issues with email authentication (SPF, DKIM, DMARC). Factors contributing to deliverability issues include poor sender reputation, spam complaints, lack of engagement, content quality, and incorrectly flagged IP addresses. To improve deliverability, experts recommend monitoring deliverability metrics, ensuring proper email authentication, warming up IP addresses, cleaning email lists, avoiding spam traps, and engaging subscribers.