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agents:SKILL.mdmcp.jsonopenapi.yml

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Can an agent send an email with Postmark Email API?

Postmark Email API decides whether an agent gets access. Interface found; job not yet run.

observedProbed revision sha256:2607d2e8acd8…

Who does each step

how grades work →

Whether the agent handles it alone or a person has to step in.

  1. 01

    Discover

    Machine

    The vendor's machine-readable docs show the agent where and how to call this job.

  2. 02

    Access

    Workaround · setup

    You give the agent a key or token.

  3. 03

    Onboard

    Gated

    Access goes through the vendor's sales or approval.

  4. 04

    Pay

    Not applicable

    Nothing to pay for the job.

  5. 05

    Confirm

    Machine

    The response or specification defines errors the agent can distinguish from success.

  6. 06

    Sustain

    Workaround · setup

    You replace or revoke the agent's access when it needs to change.

  • Access: handing over a key or token.
  • Sustain: renewing, replacing or revoking its access.

Agent surfaces

5 kinds · 16 entries
For agents
api.postmarkapp.com1 more
postmarkapp.com/llms.txt
Names the job's endpoint
ARD
postmarkapp.com/auth.md6 more
postmarkapp.com/llms.txtpostmarkapp.com/swagger/server.ymlpostmarkapp.com/swagger/account.ymlpostmarkapp.com/.well-known/api-catalogpostmarkapp.com/.well-known/mcp/server-card.jsonpostmarkapp.com/.well-known/agent-skills/index.json
ARD
API catalog
api.postmarkapp.com
api-catalog
Other
postmarkapp.com/swagger/server.yml1 more
postmarkapp.com/swagger/account.yml
OpenAPI
Skills
postmarkapp.com/.well-known/agent-skills/postmark/SKILL.md3 more
postmarkapp.com/.well-known/agent-skills/postmark-inbound.tar.gzpostmarkapp.com/.well-known/agent-skills/postmark-send-email.tar.gzpostmarkapp.com/.well-known/agent-skills/postmark-email-best-practices.tar.gz
skills index

The probe

13 Oct 2026 · 09:10 UTC · 52.93 s

Each request it sent and what came back; the descriptors it read, counted, with what they named.

Discover34 descriptor reads16 facts
Found
ARDpostmarkapp.com/.well-known/mcp/server-card.jsonARDpostmarkapp.com/.well-known/api-catalogOtherpostmarkapp.com/swagger/server.ymlOtherpostmarkapp.com/swagger/account.ymlARDpostmarkapp.com/.well-known/agent-skills/index.jsonARDpostmarkapp.com/auth.mdARDpostmarkapp.com/llms.txtAPI catalogapi.postmarkapp.comARDpostmarkapp.com/llms.txtAPI catalogapi.postmarkapp.comOtherpostmarkapp.com/swagger/server.ymlOtherpostmarkapp.com/swagger/account.ymlSkillspostmarkapp.com/.well-known/agent-skills/postmark/SKILL.mdSkillspostmarkapp.com/.well-known/agent-skills/postmark-email-best-practices.tar.gzSkillspostmarkapp.com/.well-known/agent-skills/postmark-inbound.tar.gzSkillspostmarkapp.com/.well-known/agent-skills/postmark-send-email.tar.gz
From
postmarkapp.com/.well-known/ai-catalog.json · postmarkapp.com/.well-known/api-catalog · postmarkapp.com/llms.txt · postmarkapp.com/swagger/server.yml · postmarkapp.com/swagger/account.yml · postmarkapp.com/.well-known/agent-skills/index.json
This endpoint
api.postmarkapp.com is named by a document written for agents
Job requestPOST api.postmarkapp.com/email40164 ms
Request
POST https://api.postmarkapp.com/email
Response
401 · application/json · 75 bytes
Body
sha256:fda0a6de48eb96764b48b6dbd6429c4109a80841b004760770a9217e23f2c48b
Exchange
sha256:f457928e1c55adcdf9e32281190126ad2ec93bbf25824fedcdc6b082352afa64
Resource metadataGET api.postmarkapp.com/.well-known/oauth-protected-resource/email40467 ms
Request
GET https://api.postmarkapp.com/.well-known/oauth-protected-resource/email
Response
404 · text/html · 1927 bytes
Body
sha256:a580c296b4f7d9fe056f6345bf25a7c44ca5e9ad0d11f0402db835e28cf0b2b3
Exchange
sha256:5360b5e256201ac105607910e4fddb45c63963c9636122928a183170e2d825ae
Resource metadataGET api.postmarkapp.com/.well-known/oauth-protected-resource40468 ms
Request
GET https://api.postmarkapp.com/.well-known/oauth-protected-resource
Response
404 · text/html · 1921 bytes
Body
sha256:5cbc0462e4a74d3feb6a03cc1ba4fd9041e572517831af13df8e971d1bbafff3
Exchange
sha256:9416c9afe3ff5b99f013efa1d33b02a1cc2e670fa3534b615afa9879f1a6e63a
Declared pageGET account.postmarkapp.com/login20285 ms
Request
GET https://account.postmarkapp.com/login
Response
202 · text/html · 0 bytes
Body
sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
Exchange
sha256:0987c57249c27bdc9e61c9e6ca39104f6423e786d07b264b453bafe93f4b6a22
Declared pageGET account.postmarkapp.com/sign_up406319 ms
Request
GET https://account.postmarkapp.com/sign_up
Response
406 · text/html · 0 bytes
Body
sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
Exchange
sha256:530e2b5f1d786386d1594169665335fe1d0f3622b578d614f71cdcc8f7cd17ad

Postmark on the startup-offers board

catalog record →

The grade’s badge

One image that keeps itself current, linking here.

Live badge for Postmark Email API, agent grade: D[![agent grade](https://sourcey.com/badges/agent-readiness/arp_01m4t8d81daf1r7ytb4brq4bzx.svg)](https://sourcey.com/c/postmark/agent-readiness/postmark-email-api/email-send)

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Profile
arp_01m4t8d81daf1r7ytb4brq4bzx
Projection
sha256:750092c3be05e77a6feba86fa44f73cbc29cd296363c06aa40b7c5da4e3a03d3
Policy
kind-2026-10-12.2 · sha256:b612172aad277b54461de84e006815126f2df566563954b02f4432a39cad89ac

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