generated: '2026-08-13'
method: searched
source: https://postmarkapp.com/developer/integration/official-libraries
description: >-
  First-party Postmark client libraries and tooling, as listed on the Postmark
  "Official libraries" page, with the latest published version and release date
  read from each package registry's unauthenticated metadata endpoint on
  2026-08-13. Postmark is owned by ActiveCampaign, LLC, so every first-party
  repository lives under github.com/ActiveCampaign — that is the vendor's own
  organization, not a third party.
provider: Postmark
providerId: postmark
docs:
  - https://postmarkapp.com/developer/integration/official-libraries
  - https://postmarkapp.com/developer/integration/community-libraries
registries_checked:
  - registry.npmjs.org
  - pypi.org
  - rubygems.org
  - packagist.org
  - api.nuget.org
  - repo1.maven.org
  - api.wordpress.org
packages:
  - name: postmark
    language: JavaScript/TypeScript
    registry: npm
    url: https://www.npmjs.com/package/postmark
    repository: https://github.com/ActiveCampaign/postmark.js
    official: true
    version: 5.1.0
    published: '2026-07-10'
    note: >-
      The Node.js / TypeScript SDK. Postmark's own TypeScript recipe page
      documents `import { ServerClient } from "postmark"`.

  - name: '@activecampaign/postmark-mcp'
    language: JavaScript
    registry: npm
    url: https://www.npmjs.com/package/@activecampaign/postmark-mcp
    repository: https://github.com/ActiveCampaign/postmark-mcp
    official: true
    version: 2.1.1
    published: '2026-07-13'
    kind: mcp-server
    note: >-
      The official Postmark MCP server, distributed as a local-stdio npm
      package. See mcp/postmark-mcp.yml — there is no hosted remote endpoint.

  - name: postmark-cli
    language: JavaScript
    registry: npm
    url: https://www.npmjs.com/package/postmark-cli
    repository: https://github.com/ActiveCampaign/postmark-cli
    official: true
    version: 1.6.19
    published: '2024-02-02'
    kind: cli
    note: >-
      The official CLI. The npm release is 2+ years old (2024-02-02) even though
      the repository was pushed 2026-07-17 — the published artifact lags the
      source. See cli/postmark-cli.yml.

  - name: postmark-python
    language: Python
    registry: pypi
    url: https://pypi.org/project/postmark-python/
    repository: https://github.com/ActiveCampaign/postmark-python
    official: true
    version: 0.4.0
    published: '2026-08-12'
    note: >-
      Async-first SDK, Python 3.10+. Installed as `postmark-python`; the module
      you import is `postmark`. First released 2026-04-30, so it is the newest
      first-party SDK in the set.

  - name: postmark
    language: Ruby
    registry: rubygems
    url: https://rubygems.org/gems/postmark
    repository: https://github.com/ActiveCampaign/postmark-gem
    official: true
    version: 1.25.1
    published: '2024-06-20'

  - name: postmark-rails
    language: Ruby
    registry: rubygems
    url: https://rubygems.org/gems/postmark-rails
    repository: https://github.com/ActiveCampaign/postmark-rails
    official: true
    version: 0.22.1
    published: '2022-06-29'
    note: >-
      ActionMailer delivery method. Latest release predates the current Email
      API surface (Bulk API shipped 2026-03-05) by nearly four years.

  - name: Postmark
    language: .NET
    registry: nuget
    url: https://www.nuget.org/packages/Postmark
    repository: https://github.com/ActiveCampaign/postmark-dotnet
    official: true
    version: 5.4.1
    published: '2026-07-07'

  - name: Postmark-Strong
    language: .NET
    registry: nuget
    url: https://www.nuget.org/packages/Postmark-Strong
    repository: https://github.com/ActiveCampaign/postmark-dotnet
    official: true
    version: 2.2.1
    published: '2017-04-19'
    note: >-
      Strongly-named/signed build with JSON.NET bundled. Still linked from the
      official-libraries page but last published 2017 — effectively abandoned
      relative to the mainline Postmark NuGet package (5.4.1, 2026-07-07).

  - name: com.postmarkapp:postmark
    language: Java
    registry: maven
    url: https://repo1.maven.org/maven2/com/postmarkapp/postmark/
    repository: https://github.com/ActiveCampaign/postmark-java
    official: true
    version: 1.13.0
    published: '2025-12-30'
    note: >-
      Date read from maven-metadata.xml `lastUpdated` (20251230183913); Maven
      Central publishes no per-release timestamp at that path.

  - name: wildbit/postmark-php
    language: PHP
    registry: packagist
    url: https://packagist.org/packages/wildbit/postmark-php
    repository: https://github.com/ActiveCampaign/postmark-php
    official: true
    version: v7.0.0
    published: '2025-07-11'
    note: >-
      Still published under the legacy `wildbit/` vendor namespace — Wildbit was
      Postmark's pre-acquisition parent company. `composer require
      wildbit/postmark-php` is the command Postmark's own docs give today.

  - name: craftcms/postmark
    language: PHP
    registry: packagist
    url: https://packagist.org/packages/craftcms/postmark
    repository: https://github.com/craftcms/postmark
    official: false
    version: 2.2.0
    published: '2024-03-27'
    note: >-
      Listed on Postmark's official-libraries page but maintained by Craft CMS
      (github.com/craftcms), not by Postmark/ActiveCampaign. Marked official:
      false on maintainer ownership.

  - name: postmark-approved-wordpress-plugin
    language: PHP
    registry: wordpress.org
    url: https://wordpress.org/plugins/postmark-approved-wordpress-plugin/
    repository: https://github.com/ActiveCampaign/postmark-wordpress
    official: true
    version: 1.19.1
    published: '2024-11-18'

  - name: grunt-postmark
    language: JavaScript
    registry: npm
    url: https://www.npmjs.com/package/grunt-postmark
    repository: https://github.com/ActiveCampaign/grunt-postmark
    official: true
    version: 0.0.9
    published: '2022-06-16'
    note: Build-tooling plugin; last published 2022.

  - name: postmark-nodemailer
    language: JavaScript
    registry: null
    url: https://github.com/ActiveCampaign/postmark-nodemailer
    repository: https://github.com/ActiveCampaign/postmark-nodemailer
    official: true
    version: null
    published: null
    note: >-
      Checked registry.npmjs.org for `postmark-nodemailer` on 2026-08-13 — no
      such package is published; the repository is source-only (last pushed
      2022-07-13). The nodemailer transport people actually install,
      `nodemailer-postmark-transport` (7.0.0, 2026-05-23), is a community
      package by github.com/killmenot and is NOT first-party.

  - name: Zapier Actions
    language: null
    registry: null
    url: https://postmarkapp.com/developer/integration/official-libraries
    official: true
    version: null
    published: null
    note: >-
      Listed as an official integration but distributed only through the Zapier
      platform — there is no package registry entry to date.

currency_findings:
  - >-
    Two of the eight language SDKs have not shipped a release in over two years:
    postmark-rails (2022-06-29) and Postmark-Strong for .NET (2017-04-19). The
    official CLI's last npm publish is 2024-02-02.
  - >-
    The Bulk API shipped 2026-03-05 and the Python SDK 2026-04-30, so any
    consumer on postmark-rails or postmark-approved-wordpress-plugin is running
    a client older than a meaningful part of the current API surface.
official_count: 13
package_count: 15