Postmark
Postmark is an email delivery service that helps businesses send and track transactional and broadcast email reliably, replacing SMTP with a scalable service that surfaces detailed delivery analytics, bounce tracking, open and click tracking, and dedicated IP addresses.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Postmark the way a machine reads it — 99 machine-readable artifacts across 47 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Postmark scores 57.8/100 (developing), with a separate agent-readiness read of 49/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Postmark
Each block below is one kind of artifact we hold for Postmark. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 47
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Postmark Activate API
The Activate API from Postmark — 1 operation(s) for activate.
Postmark Alias API
The Alias API from Postmark — 1 operation(s) for alias.
Postmark Batch API
The Batch API from Postmark — 2 operation(s) for batch.
Postmark Bounceid API
The Bounceid API from Postmark — 3 operation(s) for bounceid.
Postmark Bounces API API
The Bounces API API from Postmark — 5 operation(s) for bounces api.
Postmark Bounces API
The Bounces API from Postmark — 2 operation(s) for bounces.
Postmark Browser Families API
The Browser Families API from Postmark — 1 operation(s) for browser families.
Postmark Bypass API
The Bypass API from Postmark — 1 operation(s) for bypass.
Postmark Deliverystats API
The Deliverystats API from Postmark — 1 operation(s) for deliverystats.
Postmark Domains API API
The Domains API API from Postmark — 6 operation(s) for domains api.
Postmark Dump API
The Dump API from Postmark — 2 operation(s) for dump.
Postmark Email API
The Email API from Postmark — 4 operation(s) for email.
Postmark Emailclients API
The Emailclients API from Postmark — 1 operation(s) for emailclients.
Postmark Inbound API
The Inbound API from Postmark — 4 operation(s) for inbound.
Postmark Inbound Rules API API
The Inbound Rules API API from Postmark — 2 operation(s) for inbound rules api.
Postmark Locations API
The Locations API from Postmark — 1 operation(s) for locations.
Postmark Message Identifier API
The Message Identifier API from Postmark — 2 operation(s) for message identifier.
Postmark Messages API API
The Messages API API from Postmark — 11 operation(s) for messages api.
Postmark Messages API
The Messages API from Postmark — 11 operation(s) for messages.
Postmark Messages > Inbound > {Messageid} API
The Messages > Inbound > {Messageid} API from Postmark — 1 operation(s) for messages > inbound > {messageid}.
Postmark Messages > Outbound > Clicks API
The Messages > Outbound > Clicks API from Postmark — 1 operation(s) for messages > outbound > clicks.
Postmark Messages > Outbound > {Messageid} API
The Messages > Outbound > {Messageid} API from Postmark — 1 operation(s) for messages > outbound > {messageid}.
Postmark Messages > Outbound > Opens API
The Messages > Outbound > Opens API from Postmark — 1 operation(s) for messages > outbound > opens.
Postmark Outbound API
The Outbound API from Postmark — 20 operation(s) for outbound.
Postmark Platforms API
The Platforms API from Postmark — 2 operation(s) for platforms.
Postmark Readtimes API
The Readtimes API from Postmark — 1 operation(s) for readtimes.
Postmark Retry API
The Retry API from Postmark — 1 operation(s) for retry.
Postmark Sender Signatures API API
The Sender Signatures API API from Postmark — 5 operation(s) for sender signatures api.
Postmark Sending API API
The Sending API API from Postmark — 4 operation(s) for sending api.
Postmark Sends API
The Sends API from Postmark — 1 operation(s) for sends.
Postmark Server Configuration API API
The Server Configuration API API from Postmark — 1 operation(s) for server configuration api.
Postmark Server Management API API
The Server Management API API from Postmark — 2 operation(s) for server management api.
Postmark Servers API
The Servers API from Postmark — 1 operation(s) for servers.
Postmark Spam API
The Spam API from Postmark — 1 operation(s) for spam.
Postmark Statistics API
The Statistics API from Postmark — 13 operation(s) for statistics.
Postmark Stats API API
The Stats API API from Postmark — 12 operation(s) for stats api.
Postmark Stats/Outbound API
The Stats/Outbound API from Postmark — 2 operation(s) for stats/outbound.
Postmark Stats/Outbound > Clicks API
The Stats/Outbound > Clicks API from Postmark — 1 operation(s) for stats/outbound > clicks.
Postmark Stats/Outbound > Opens API
The Stats/Outbound > Opens API from Postmark — 1 operation(s) for stats/outbound > opens.
Postmark Template API
The Template API from Postmark — 2 operation(s) for template.
Postmark Templates API API
The Templates API API from Postmark — 6 operation(s) for templates api.
Postmark Templates API
The Templates API from Postmark — 4 operation(s) for templates.
Postmark Triggerid API
The Triggerid API from Postmark — 1 operation(s) for triggerid.
Postmark Triggers API
The Triggers API from Postmark — 4 operation(s) for triggers.
Postmark Triggers > Inboundrules API
The Triggers > Inboundrules API from Postmark — 1 operation(s) for triggers > inboundrules.
Postmark Triggers > Tags API
The Triggers > Tags API from Postmark — 1 operation(s) for triggers > tags.
Postmark Validate API
The Validate API from Postmark — 1 operation(s) for validate.
Scroll within the panel for all 47 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Postmark API
OPEN COLLECTIONAgent Skills 6
An agent skill packages the how-to for driving these APIs from an assistant — the prompts, the sequence, the guardrails — so the knowledge to use the API travels with it.
Packaged agent skills for driving this provider's APIs from an AI assistant.
postmark-email-best-practices
AGENT SKILLpostmark-inbound
AGENT SKILLpostmark-send-email
AGENT SKILLpostmark-templates
AGENT SKILLpostmark-webhooks
AGENT SKILLpostmark
AGENT SKILLGraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
Postmark GraphQL Schema
This document describes a conceptual GraphQL schema for the Postmark transactional email API. Postmark provides a REST API for sending and tracking transactional and broadcast e...
GRAPHQLPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Postmark Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Postmark Finops
FINOPSFeatures 16
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Scroll within the panel for all 16 ·
Event Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Postmark Webhooks
AsyncAPI description of Postmark's outbound webhook surface. Postmark delivers event notifications by issuing HTTP POST requests with a JSON body to a URL the customer configure...
ASYNCAPISpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Postmark API Rules
SPECTRALPostmark API Rules
SPECTRALJSON Schema 19
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
CreateServerPayload
JSON SCHEMADKIMRotationResponse
JSON SCHEMADomainCreationModel
JSON SCHEMADomainEditingModel
JSON SCHEMADomainExtendedInformation
JSON SCHEMADomainInformation
JSON SCHEMADomainListingResults
JSON SCHEMADomainSPFResult
JSON SCHEMAEditServerPayload
JSON SCHEMAExtendedServerInfo
JSON SCHEMASenderListingResults
JSON SCHEMASenderSignatureCreationModel
JSON SCHEMASenderSignatureEditingModel
JSON SCHEMASenderSignatureExtendedInformation
JSON SCHEMASenderSignatureInformation
JSON SCHEMAServerListingResponse
JSON SCHEMAStandardPostmarkResponse
JSON SCHEMATemplatesPushModel
JSON SCHEMATemplatesPushResponse
JSON SCHEMAScroll within the panel for all 19 ·
JSON Structure 1
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Postmark Structure
JSON STRUCTURESecurity Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Postmark — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 4
The organization behind the API
Other 1
Properties that don't map to a standard resource type
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