Postmastery vs.
Fraudmarc Community Edition in 2026

Postmastery grouped Microsoft 365 and Google Workspace quickly, then gave us enough context to separate approved SendGrid traffic from a support desk sender using the same corporate domain. Mailchimp needed extra review because the DKIM pass used a subdomain, but the product made the policy impact clearer than raw aggregate rows. The unknown sender still needed analyst judgement, yet the workflow pointed us toward ownership rather than leaving only IP and envelope-domain clues.

Fraudmarc CE collected the same reports into our AWS account and made the underlying evidence easy to inspect. SendGrid, Mailchimp, Microsoft 365, and Google Workspace appeared in the aggregate data, but the naming and ownership work stayed more technical. The SPF pass with visible from mismatch surfaced as a clear authentication edge case, though the next step depended on our own notes and DNS checks.

Postmastery was smoother when we added the corporate domain, marketing subdomain, and parked domain. The parked domain moved cleanly toward a reject-ready discussion after the spoof sample appeared, while the marketing subdomain needed more sender review before any policy change. Finding the unknown sender took several drilldowns, but the interface kept the evidence tied to DMARC action instead of making us rebuild the context outside the product.

Fraudmarc CE took longer to start because the AWS account, CDK deployment, SES receipt path, and storage choices had to be set up before the first useful report review. Once running, it was useful for inspecting raw traffic and validating the forwarded mail SPF failure, but explaining that failure to a non-technical stakeholder required our own write-up. The unknown sender was findable, yet classification depended on DNS, IP ownership checks, and our internal sender list.

Postmastery worked better when we treated setup like an enterprise project. The DNS changes for the three domains were easier to package for an infrastructure team, and the escalation path was clearer when the support desk sender failed our expected authentication pattern. We still wanted more transparent public pricing, but the support motion matched a buyer that needs handoff notes and stakeholder-ready enforcement evidence.

Fraudmarc CE support felt like a technical open source workflow. The install path was clear enough for an engineer with AWS, CDK, SES, and DNS experience, but a deliverability owner without that background would need internal platform help. DNS handoff and escalation were not vendor-led in our test, so the buyer has to own deployment, logs, upgrades, and incident response.

Postmastery was the better match for an enterprise buyer with several internal owners. Domain grouping worked well enough for the corporate domain, marketing subdomain, and parked domain, and recurring reporting gave us a useful way to explain why the parked domain could move faster than the marketing subdomain. For MSP use, the account separation and client handoff process needed more discipline from our team than we would want at high client volume.

Fraudmarc CE was a better match for an SMB or technical operator that wants free software and control of DMARC data in AWS. It handled unlimited domain collection in principle, but tenant separation, recurring client reports, and handoff notes were not as ready for an MSP workflow. Enterprise buyers would also need to account for platform maintenance, alert routing, security review, and internal support ownership before rollout.