mailcheck-email-verification

What This Skill Does

The mailcheck-email-verification skill integrates the powerful MailCheck API into your OpenClaw agent workflow, enabling automated email validation and threat detection. It is designed to handle individual lookups or bulk processing of up to 100 addresses simultaneously. Beyond simple syntax checks, the skill performs deep DNS and SMTP verification to confirm mailbox existence, coupled with sophisticated authenticity analysis to flag potential phishing, spoofing, or CEO fraud attempts using header inspection. Users receive a risk score from 0-100 to quickly categorize the reliability of any incoming or outgoing correspondence.

Installation

To integrate this skill into your environment, use the OpenClaw package manager. Ensure you have your MailCheck API key ready for configuration. Run the following command in your terminal:

clawhub install openclaw/skills/skills/bnuyts/mailcheck-email-verification

After installation, it is recommended to set your API key as an environment variable: export MAILCHECK_API_KEY='your_api_key_here'. This allows you to perform operations without passing the key as an argument in every function call.

Use Cases

This skill is indispensable for CRM data hygiene, ensuring your outreach campaigns reach real humans. It is also a critical security layer for automated support desks, helping agents identify potentially malicious email headers before interacting with high-risk senders. Marketing teams can use the bulk verification tool to clean lead lists, effectively reducing bounce rates and protecting sender reputation.

Example Prompts

1. "Verify the email list in my active spreadsheet and tell me which ones are disposable or high-risk."
2. "Analyze the headers of this incoming email to see if there are any signs of spoofing or phishing attempts."
3. "Check if [email protected] is a valid email address so I can add it to our whitelist."

Tips & Limitations

To maximize efficiency, always use the bulk verification command for lists larger than five emails to minimize API request overhead. Note that while the SMTP check is highly accurate, some mail servers may be configured to accept all mail (catch-all), which might result in 'valid' statuses for non-existent addresses. Always cross-reference the risk score provided; a medium risk score often warrants further investigation rather than an automatic rejection.