DMARC feedback is only based on the MTA (Message Transport Agent) handling the mail. I don't have much experience with DMARC reports but Senders typically use i

DMARC feedback is only based on the MTA (Message Transport Agent) handling the mail. I don't have much experience with DMARC reports but Senders typically use it when they are first Setting up DMARC. It is up to the receiving MTA to send the inbox/spam result according to the RFC. I think that the reports are aggregated so single inboxes are not able to be detected. I don't think many people actually send / follow up on DMARC reports imo. Source: https://tools.ietf.org/html/rfc7489#section-7.3 https://tools.ietf.org/html/rfc7489#section-7.3