Experts, marketers, and documentation sources converge on the idea that Signal Spam serves primarily as a feedback mechanism for identifying spam and potential deliverability issues in French domains. It's not a certification or a direct solution to deliverability problems. Improving email delivery to French domains requires a comprehensive approach that includes technical compliance (SPF, DKIM, DMARC), maintaining a good sender reputation, adhering to best practices for content and list hygiene, direct engagement with French ISPs, and understanding regional regulations. Signal Spam can provide valuable data points on user complaints, but these must be acted upon in conjunction with broader deliverability efforts.