Despite consistent engagement, a drop in inbox placement can be attributed to a multitude of factors. Sender reputation, influenced by spam complaints, sending to invalid addresses, or landing in the bulk folder, plays a critical role. Poor list hygiene, IP and domain reputation issues, and failing email authentication (SPF, DKIM, DMARC) can also trigger spam filters. Content quality, inconsistent sending frequency, and changes in user behavior further contribute to placement problems. Moving to a new platform resets your sender reputation, while misconfigured DMARC policies or a lack of feedback loop integration can block legitimate emails or mask spam complaints. Inaccurate seed list results can also obscure the actual deliverability issue, and new or recently changed domains experience reduced placement due to unestablished reputation. Issues with third-party tools can also negatively affect deliverability.