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/install mailcheck-email-verification
Description
Email verification skill for MailCheck API - verify emails, bulk processing, authenticity analysis
README (SKILL.md)
MailCheck Email Verification
Verify email addresses with the MailCheck API - comprehensive email validation with syntax, disposable, DNS, and SMTP checks.
Features
- Single Email Verification - Verify one email at a time
- Bulk Verification - Verify up to 100 emails in one request
- Authenticity Analysis - Detect phishing, spoofing, and email fraud
- Risk Scoring - 0-100 score with risk level (low/medium/high)
Commands
email-verify - Verify single email
Verifies a single email address.
Parameters:
email(required): Email address to verifyapi_key(optional): MailCheck API key (falls back toMAILCHECK_API_KEYenv var)
Example:
email-verify email="[email protected]" api_key="sk_live_..."
email-bulk-verify - Bulk verification
Verifies up to 100 email addresses in one request.
Parameters:
emails(required): Array of email addressesapi_key(optional): MailCheck API key
Example:
email-bulk-verify emails="[[email protected], [email protected]]" api_key="sk_live_..."
email-auth-verify - Email authenticity analysis
Analyzes email headers for spoofing, phishing, and CEO fraud.
Parameters:
headers(required): Email headers to analyzetrusted_domains(optional): Domains for lookalike detectionapi_key(optional): MailCheck API key
Example:
email-auth-verify headers="From: [email protected]\
Received: ..." trusted_domains="[company.com]"
Environment Variables
Set MAILCHECK_API_KEY with your MailCheck API key to avoid passing it on every command.
Installation
This skill is available on ClawHub.
clawhub install mailcheck-email-verification
API Reference
See full API documentation: https://api.mailcheck.dev/docs
Repository
Source code: https://github.com/bnuyts/mailcheck-skill
License
MIT
Usage Guidance
This skill appears to implement exactly what it says: it sends supplied emails/headers to api.mailcheck.dev and requires a MailCheck API key. However, the registry metadata does not declare that MAILCHECK_API_KEY is required — the SKILL.md and code do. Before installing: (1) treat your API key as a secret — prefer setting MAILCHECK_API_KEY in your agent's secure environment rather than pasting keys into command arguments or examples; (2) consider creating a dedicated MailCheck key with minimal scope and rotate/revoke it if exposed; (3) review the published GitHub repo (https://github.com/bnuyts/mailcheck-skill) to confirm authorship and any updates; (4) be aware that sending full email headers can include PII and authentication artifacts (SPF/DKIM/Message-IDs) — only send what you need; (5) ask the publisher or registry to correct the metadata to declare MAILCHECK_API_KEY as a required env var so the permission model is accurate.
Capability Analysis
Type: OpenClaw Skill
Name: mailcheck-email-verification
Version: 1.1.0
The skill provides email verification and authenticity analysis via the MailCheck API. All network requests are directed to the legitimate `https://api.mailcheck.dev` endpoint. API keys are handled securely by accepting them as parameters or from the `MAILCHECK_API_KEY` environment variable. The `index.js` code uses standard `fetch` calls without any risky command execution (e.g., `eval`, `exec`, `os.system`) or attempts to access unrelated sensitive data. Both `SKILL.md` and `README.md` are purely descriptive and contain no prompt injection attempts or manipulative instructions targeting the AI agent. The `package.json` lists no external dependencies, reducing supply chain risk. Minor version inconsistencies across files are not security-relevant.
Capability Assessment
Purpose & Capability
Name, README, SKILL.md, package.json, and index.js all describe an email verification integration with api.mailcheck.dev and the code performs the described POSTs to /v1/verify, /v1/verify/bulk, and /v1/verify/auth. Functionality matches the stated purpose.
Instruction Scope
Runtime instructions only call the MailCheck API endpoints and accept parameters (email(s), headers, trusted_domains, api_key). They do not instruct the agent to read unrelated files, system credentials, or to call external endpoints other than api.mailcheck.dev.
Install Mechanism
There is no install spec (instruction-only in registry), but the package includes index.js and package.json — i.e., code will run on the agent platform. No external downloads or opaque installers are used. This is reasonable but the absence of an install spec should be noted by users who expect instruction-only skills.
Credentials
SKILL.md and index.js expect a MAILCHECK_API_KEY env var or an api_key parameter, but the registry metadata lists no required environment variables or primary credential. The skill legitimately needs an API key to function, so the metadata omission is an incoherence and could lead to confusion or accidental key exposure (examples show inline keys).
Persistence & Privilege
Skill is not marked always:true, does not request system-level config paths, and does not modify other skills. It runs as a normal (user-invocable / agent-invokable) skill.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install mailcheck-email-verification - After installation, invoke the skill by name or use
/mailcheck-email-verification - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.1.0
Updated with single/bulk verification commands and authenticity analysis
v1.0.0
Initial release: single email verification, bulk verification, and email authenticity analysis
Metadata
Frequently Asked Questions
What is MailCheck Email Verification?
Email verification skill for MailCheck API - verify emails, bulk processing, authenticity analysis. It is an AI Agent Skill for Claude Code / OpenClaw, with 330 downloads so far.
How do I install MailCheck Email Verification?
Run "/install mailcheck-email-verification" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is MailCheck Email Verification free?
Yes, MailCheck Email Verification is completely free (open-source). You can download, install and use it at no cost.
Which platforms does MailCheck Email Verification support?
MailCheck Email Verification is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created MailCheck Email Verification?
It is built and maintained by bnuyts (@bnuyts); the current version is v1.1.0.
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