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.

An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.

Against inbound parsing into tool calls and model-generated sends that must not duplicate, Postmark DMARC covers event stream, and does not cover inbound parsing, idempotency keys, webhook coverage, batch sending, SDK breadth, and multi-tenant support. Whether that gap matters depends on how central those are to the build.

• Inbound parsing: No
• Idempotency keys: No
• Webhooks: No
• Operating since: Not published
• Event stream: Yes
• Best published rate per 1,000: Tiers not published in comparable form
• Batch sending: No
• SDKs: None
• Multi-tenant: No

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.