Agari Brand Protection vs.
Postmastery in 2026

We loaded Microsoft 365 and Google Workspace as core sources, then added SendGrid, Mailchimp, and the support desk sender. Agari resolved Microsoft 365, Google Workspace, SendGrid, and Mailchimp quickly; the unknown sender appeared as IP and reverse DNS first, then needed manual owner tagging. The SPF pass with visible from mismatch was flagged as a DMARC failure reason, and the DKIM pass on a subdomain gave enough detail to decide whether the subdomain should send.

Postmastery handled Microsoft 365 and Google Workspace setup with less ceremony and grouped SendGrid and Mailchimp into service views after we confirmed the envelope patterns. It explained forwarded mail with SPF failure clearly, but unknown sender classification was more operator-led: we used IP, HELO, and sample headers before assigning a business owner. The feature set felt broader for deliverability reporting than for automated DNS repair.

Agari took the longest to onboard across the primary domain, marketing subdomain, and parked domain because we had to decide how each domain should move through policy states before the views felt useful. The unknown sender appeared with enough raw evidence to investigate, but classifying it required manual owner notes. The forwarded mail SPF failure was technically accurate, although the explanation needed translation before a marketing owner understood why DKIM carried the message.

Postmastery's first-run flow was lighter for all three domains, and the marketing subdomain was usable within the same setup session once Microsoft 365 and SendGrid data appeared. The unknown sender workflow felt more like an investigation queue, with headers and IP clues close to the classification step. The forwarded mail SPF failure was easier to explain because the UI separated forwarding behavior from direct spoofing.

During setup, Agari's expectations were enterprise-oriented: DNS handoff, approved sender inventory, and policy movement decisions all needed a named owner. The support path was better for escalation on the spoof sample and visible from mismatch than for quick self-serve answers. We would budget time for professional onboarding before changing a high-volume corporate domain to quarantine or reject.

Postmastery was more comfortable when we handled setup ourselves and used support for interpretation instead of step-by-step DNS ownership. DNS handoff on the parked domain was simple, but enterprise onboarding artifacts were lighter than Agari's. For MSP-style use, the support experience depended more on our own handoff notes, report templates, and sender classification discipline.

Agari made the most sense for an enterprise that has central DNS control, a security escalation queue, and owners for Microsoft 365, Google Workspace, SendGrid, Mailchimp, and the support desk sender. Account separation was adequate for business units, but it did not feel optimized for a consultant switching between many small clients. Recurring reporting was strong for governance, while client handoff took extra explanation.

Postmastery fit the operator model better across our three-domain test because domain grouping, recurring reports, and sender notes were closer to the daily workflow. The parked domain and marketing subdomain were easy to separate for review, and the unknown sender could be held in a queue until a client owner approved it. For a large enterprise, policy evidence and escalation artifacts felt lighter than Agari.