Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ActiveCampaign/postmark-skills --skill postmark-send-emailgit clone --depth 1 https://github.com/ActiveCampaign/postmark-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/activecampaign/postmark-skills/postmark-send-email)<a href="https://agentmods.dev/skills/activecampaign/postmark-skills/postmark-send-email"><img src="https://agentmods.dev/badge/skills/activecampaign/postmark-skills/postmark-send-email.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 57 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 106 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 142 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00043 | $0.02610 |
| Opus 5 | $0.00022 | $0.01305 |
| Sonnet 5 | $0.00009 | $0.00522 |
| Haiku 4.5 | $0.00004 | $0.00261 |
Grade A, and why
postmark-send-email scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Send Email with Postmark
Overview
Postmark provides multiple endpoints for sending emails:
| Approach | Endpoint | Use Case | Limits |
|---|---|---|---|
| Single | POST /email |
Individual transactional emails | 1 email, 10 MB payload including attachments |
| Batch | POST /email/batch |
Up to 500 emails in one request | 500 emails, 50 MB payload including attachments |
| Template | POST /email/withTemplate |
Dynamic content with server-side templates | 1 email, 10 MB payload including attachments |
| Batch Template | POST /email/batchWithTemplates |
Bulk templated emails | 500 emails, 50 MB payload including attachments |
| Bulk | POST /email/bulk |
Broadcast stream campaigns | No fixed recipient cap, 50 MB payload including attachments |
Choose batch when: sending 2+ distinct emails at once, performance matters, or attachments are needed. Choose single when: sending one email or real-time per-message error handling is needed.
Message Streams (CRITICAL)
Postmark separates emails by intent. Always specify MessageStream:
| Stream | Value | Purpose | SMTP Endpoint |
|---|---|---|---|
| Transactional | outbound |
1:1 triggered emails (default) | smtp.postmarkapp.com |
| Broadcast | broadcast |
Marketing, newsletters | smtp-broadcasts.postmarkapp.com |
Never mix transactional and broadcast in the same stream — it damages deliverability. Servers can have up to 10 message streams.
Quick Start
- Get API Token from your Postmark server settings
- Verify sender domain or email address
- Install SDK — see references/installation.md
- Choose endpoint based on the decision matrix above
Authentication
All API requests require the Server API Token:
X-Postmark-Server-Token: your-server-token-here
Store the token in POSTMARK_SERVER_TOKEN. For testing without sending, use POSTMARK_API_TEST as the token value.
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 279 lines · 43 tokens per session scan A b2debe5cbf59
postmark-send-email is a skill published in the GitHub repository ActiveCampaign/postmark-skills (45 stars, last pushed 20d ago), licensed MIT. It adds 43 tokens to every session and 2,610 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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