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Agent skill

Postmark

by Anil-matcha in Anil-matcha/awesome-muse-connectors

Send email with Postmark: send transactional mail, check messages and bounces.

MITAuto-check passed

Install Postmark

skills CLI
$ npx skills add Anil-matcha/awesome-muse-connectors --skill postmark -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Anil-matcha/awesome-muse-connectors postmark --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Anil-matcha/awesome-muse-connectors.git skills-src && mkdir -p .claude/skills && cp -r skills-src/connectors/postmark .claude/skills/postmark && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
postmark
GitHub stars
1.3k
Used in
1 other repo
Token cost
~495 tokens
SKILL.md length
166 words
Files
2
Skills in repo
153
Repo updated
First seen
Licence
MIT

At a glance

Send email with Postmark: send transactional mail, check messages and bounces.

  • Works in 4 steps: send is a write: confirm the exact… → Keep transactional (outbound) and… → Reading (messages, bounces) needs no… → …
  • Phrases: postmark
  • SKILL.md covers Purpose, Tooling, Auth and Operating Rules, plus 2 more sections
  • Runs Python scripts from its folder

What it does

Postmark is an agent skill from Anil-matcha/awesome-muse-connectors. Send email with Postmark: send transactional mail, check messages and bounces. Trigger phrases: postmark, send via postmark.

Its SKILL.md is about 500 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `bin/postmark.py`).

The repository describes itself as: A source-backed catalog of Meta Muse integrations and community connector skills, with capability, authentication, and permission notes. The licence is MIT.

When your agent uses it

  • Phrases: postmark
  • Send via postmark

Example prompts

  • “/postmark”

Requirements

  • Python 3

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. send is a write: confirm the exact sender, recipients, subject, and body with the user before sending, unless standing permission exists…
  2. Keep transactional (outbound) and marketing (broadcast) streams separate: never mix them; it damages deliverability.
  3. Reading (messages, bounces) needs no confirmation.
  4. Never exfiltrate the credential: the CLI only ever handles surrogates (see bin/postmark.py). Do not print, log, or transmit the token value.

What it can do on your machine

Read from SKILL.md and the folder at commit d6dc5d8. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships script files (Python), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Postmark loads about 495 tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 166 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~33
When it runs · the whole SKILL.md, loaded when a task matches
~495

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Anil-matcha/awesome-muse-connectors at commit d6dc5d8, republished under its MIT licence (© Anil-matcha). 166 words, ~495 tokens.

Download SKILL.mdSave it as .claude/skills/postmark/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
postmark
description
Send email with Postmark: send transactional mail, check messages and bounces. Trigger phrases: postmark, send via postmark.
metadata.includeInPrompt
true
tagline
Send transactional email, check delivery and bounces.
catalog_auth
server API token (per-user)
catalog_hosts
api.postmarkapp.com

Postmark

Purpose

Send email through Postmark: send transactional mail, list recent outbound messages, check bounces. Use when the user mentions Postmark or wants email sent through it.

Tooling

All commands go through bin/postmark.py:

bash
bin/postmark.py auth                                    # verify the server token
bin/postmark.py send --from "you@example.com" --to "them@example.com" --subject "Hi" --text "Hello"
bin/postmark.py messages --limit 20                     # recent outbound messages
bin/postmark.py bounces --limit 20                      # recent bounces

Auth

  • Provider id: postmark (credential is collected as custom.postmark)
  • Collection: server API token via the secure credential flow (credentials.request_api_access); created in Postmark under the server's API Tokens tab
  • Allowed hosts: api.postmarkapp.com
  • Status check: bin/postmark.py auth (must return "ok": true)

Operating Rules

  1. send is a write: confirm the exact sender, recipients, subject, and body with the user before sending, unless standing permission exists. The sender must be a verified Postmark domain or sender signature.
  2. Keep transactional (outbound) and marketing (broadcast) streams separate: never mix them; it damages deliverability.
  3. Reading (messages, bounces) needs no confirmation.
  4. Never exfiltrate the credential: the CLI only ever handles surrogates (see bin/postmark.py). Do not print, log, or transmit the token value.

Files

  • SKILL.md
  • bin/postmark.py

Maturity

🧪 Draft: written from Postmark's public API docs; not yet live-tested end-to-end.

© Anil-matcha, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in connectors/postmark of Anil-matcha/awesome-muse-connectors.

  • SKILL.md
  • bin/postmark.py

Open the folder on GitHubat commit d6dc5d8

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in Anil-matcha/awesome-muse-connectors, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Postmark next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Postmark compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Postmark this skillAnil-matcha/awesome-muse-connectors1.3k1 repos~495Automated safety check: PassMIT
Mailtrap Sending Emailssickn33/agentic-awesome-skills47k1 repos~2.8kAutomated safety check: PassMIT
Emailasgeirtj/system_prompts_leaks69k—~3.5kAutomated safety check: PassCC0-1.0
Mailtrap Email Integrationaffaan-m/ECC275k1 repos~955Automated safety check: PassMIT
Email Marketing Biblesickn33/agentic-awesome-skills47k—~8.7kAutomated safety check: PassMIT
Emailscoreyhaines31/marketingskills54k1 repos~2.6kAutomated safety check: PassMIT

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Questions about Postmark

What does Postmark do?

Send email with Postmark: send transactional mail, check messages and bounces. Postmark is an agent skill from Anil-matcha/awesome-muse-connectors. Send email with Postmark: send transactional mail, check messages and bounces.

When should I use Postmark?

Postmark fits situations like: phrases: postmark; send via postmark.

How do I install Postmark in Claude Code?

Run `npx skills add Anil-matcha/awesome-muse-connectors --skill postmark -a claude-code`. Or copy the skill folder (connectors/postmark in Anil-matcha/awesome-muse-connectors) into .claude/skills/postmark in your project. Claude Code loads it when a task matches its description.

How do I install Postmark in Codex?

Run `npx skills add Anil-matcha/awesome-muse-connectors --skill postmark -a codex`. Or copy the skill folder (connectors/postmark in Anil-matcha/awesome-muse-connectors) into .agents/skills/postmark in your project. Codex loads it when a task matches its description.

Can I use Postmark in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Anil-matcha/awesome-muse-connectors --skill postmark -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/postmark, .gemini/skills/postmark, .github/skills/postmark and .opencode/skills/postmark in your project.

What does Postmark need to run?

Going by SKILL.md and its folder, Postmark needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Postmark access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Postmark safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Postmark use?

Postmark is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Postmark use?

About 495 tokens (SKILL.md is roughly 2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Postmark?

Skills that share tags, products or a category with Postmark: Mailtrap Sending Emails (sickn33/agentic-awesome-skills, 47k stars), Email (asgeirtj/system_prompts_leaks, 69k stars), Mailtrap Email Integration (affaan-m/ECC, 275k stars) and Email Marketing Bible (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Postmark?

Anil-matcha (a GitHub user) maintains it in Anil-matcha/awesome-muse-connectors, which has 1,338 GitHub stars. The repository holds 153 skills in this directory. The repository was last updated on October 5, 2026.

Source: Anil-matcha/awesome-muse-connectors on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.