Postmark DMARC

Postmark DMARC is the lightweight DMARC monitoring service attached to Postmark. The free version turns aggregate reports into weekly email digests. DMARC Digests adds a dashboard, more source detail, longer history, user management, and a paid per-domain plan.

Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.

Against high-frequency programmatic sends where a missed delivery is a product failure, Postmark DMARC covers event stream, and does not cover idempotency keys, webhook coverage, the suppressions API, batch sending, and SDK breadth. Whether that gap matters depends on how central those are to the build.

• Idempotency keys: No
• Webhooks: No
• Event stream: Yes
• Operating since: Not published
• Suppressions API: No
• Best published rate per 1,000: Tiers not published in comparable form
• Batch sending: No
• SDKs: None
• Deliverability: Not a sender. Best used to monitor DMARC alignment and identify unauthorized or misconfigured mail sources.

Not a sender. Best used to monitor DMARC alignment and identify unauthorized or misconfigured mail sources.

Teams that need simple DMARC monitoring without adopting a larger security platform.

Agencies and security teams that need multi-tenant dashboards or enforcement workflows.