How to protect your email domain and sending reputation

AI-driven phishing and spoofing have made email-domain abuse faster and more scalable, making strong authentication and sender reputation management essential. The article explains that SPF, DKIM, and DMARC work together to validate senders, with domain alignment and DKIM signing particularly important because forwarding can break SPF; a DMARC policy of p=none only monitors abuse, while p=reject is needed to block unauthorized mail. It recommends monitoring DMARC reports for several weeks, identifying and fixing every legitimate sending service, then moving through quarantine to rejection while using sp=reject to protect subdomains and avoiding the obsolete pct tag removed by RFC 9989. Transactional and marketing messages should use separate subdomains, DKIM keys, return paths, provider accounts, and potentially IP pools so marketing complaints do not affect password resets, receipts, or alerts. Ongoing deliverability practices include maintaining low spam rates, honoring unsubscribes, removing stale recipients and DNS records, using stable reply-capable sender addresses, warming new sending identities gradually, and protecting inactive domains with restrictive SPF and DMARC policies. Google Postmaster Tools, Microsoft SNDS, Yahoo Sender Hub, DMARC reporting services, and AI-assisted DNS, report, sender, stream, and configuration audits can help organizations identify weaknesses and maintain compliance.

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