Receiving multiple DMARC reports from the same domain is a common occurrence stemming from various factors related to email sending infrastructure, authentication, and reporting practices. Primarily, each email receiving organization (like Gmail, Yahoo, etc.) generates its own DMARC report for each sending domain. High report volume can also arise from using multiple Email Service Providers (ESPs), each of which will generate separate reports. Furthermore, variations within the email stream itself, such as different source IPs, subdomains, or authentication results, can trigger multiple reports even within the same reporting period. Experts emphasize the importance of analyzing these reports to understand the underlying causes, checking email headers, source IPs, and the involvement of third-party senders. Reports from domains that don't send email and issues in SPF alignment are other notable considerations, as is the need for regular monitoring of DMARC reports.