Netcraft Fraud Detection vs.
Postmastery in 2026

In Netcraft, Microsoft 365 and Google Workspace appeared quickly as trusted mail sources once aggregate reports arrived. SendGrid and Mailchimp required manual grouping because the product treated campaign traffic more like fraud intelligence than a marketing ownership task. The unknown sender was marked as suspicious after we attached the spoof sample, and the SPF pass with visible From mismatch was easier to investigate than the forwarded SPF failure because Netcraft showed the suspicious domain relationship, not a DMARC-specific forwarding explanation.

Postmastery handled Microsoft 365, Google Workspace, SendGrid, and Mailchimp as recognizable sending sources with owner-friendly labels, which made the daily review faster. The DKIM pass on a subdomain was easy to trace to the marketing subdomain, while the unauthorized spoof sample needed more analyst review before it became a confident block. The unknown sender classification sat in a queue-like workflow that helped us assign ownership, but the broader fraud context was thinner than Netcraft.

Netcraft onboarding felt like an enterprise intake. The primary corporate domain and parked domain were straightforward, but the marketing subdomain needed support to decide the exact reporting handoff and ownership model. Finding the unknown sender required a drilldown into event context and a comparison with the spoof sample, and the forwarded SPF failure was visible without a plain operator explanation.

Postmastery was more linear. We added the corporate domain, marketing subdomain, and parked domain with fewer decision points, then reviewed approved senders in a source list that matched how domain owners talk about Microsoft 365, Google Workspace, SendGrid, Mailchimp, and the support desk. The unknown sender was easier to classify, and the forwarded mail case explained why SPF failed while DKIM kept the message from becoming an enforcement blocker.

Netcraft support expectations were enterprise-led. Setup centered on scoping, threat profile, covered brands, and escalation rules before the DNS work felt complete. The DNS handoff was clear once the path was agreed, and the enterprise onboarding model fit the corporate and parked domains better than the marketing subdomain.

Postmastery support felt closer to practical DMARC operations. The handoff notes for Google Workspace, SendGrid DKIM, and Mailchimp ownership were easier to send to domain owners, and the forwarded SPF explanation needed less translation. Escalation was less formal than Netcraft, but the day-to-day setup questions were answered in a more operator-friendly style.

Netcraft account separation was strongest at the enterprise level, where brands, regions, and escalation paths mattered more than light client switching. Domain grouping favored brand and threat context, and recurring reports read like security updates. For MSP or SMB work, the handoff felt heavy because a small domain owner still needed help turning the fraud view into a DMARC policy plan.

Postmastery was easier to map to regular DMARC ownership. Domain grouping worked for the corporate domain, marketing subdomain, and parked domain, and recurring reports were easier to share with non-security stakeholders. Account separation was usable for internal teams and smaller agencies, but deeper MSP permissioning and client-by-client alert routing needed closer validation.