Postmetry - 2026 Pricing, Features, Reviews & Alternatives

Postmetry is a cloud-based external monitoring service for email campaigns, designed for marketing and CRM teams, Data Protection Officers, CIOs, CISOs, and agencies that need independent, verifiable insight into what subscribers actually receive. Operating from controlled inbox addresses external to the sender's infrastructure, Postmetry requires no installation on sender systems and no access to sender platforms. It measures email campaigns from the recipient's perspective, detecting tracking pixels, tracked links, and other email-level tracking mechanisms embedded in messages.

The platform offers two tiers: a free one-off audit tool that reads a single send as a recipient would, identifying all tracking pixels and tracked links with code excerpts evidencing each finding, and a Pro version for continuous, scheduled monitoring of ongoing email campaigns. Analyzers are deterministic and versioned, producing identical results when replayed months later, which supports longitudinal compliance verification. Raw messages are written once to a read-only, immutable archive stored in Europe, and no resources are ever loaded from received messages during measurement, meaning no images or links are triggered and no data is leaked to third-party tracking vendors.

Postmetry is applicable across any industry where email campaigns are sent to subscribers, with particular relevance to legal and compliance functions. Every finding is backed by a reproducible proof artifact attached to reports, supporting compliance verification for regulations governing email tracking, including PECR/ICO in the UK, CNIL in France, and Garante in Italy. Because the observation point is the inbox itself rather than the sender's platform, findings represent an independent, auditable record of recipient-side email content.