Hunter Automation

Power your outreach with Hunter.io -- discover email addresses by domain, find specific people's emails, verify deliverability, save leads, and track your API usage -- all through natural language commands.

Toolkit docs: composio.dev/toolkits/hunter

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Setup

1. Add the Composio MCP server to your client configuration:

   https://rube.app/mcp
   

2. Connect your Hunter.io account when prompted (API key authentication).
3. Start issuing natural language commands to find and verify emails.

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Core Workflows

1. Search Domain for Email Addresses

Discover all publicly available email addresses for a given domain or company, with filtering by department, seniority, and type.

Tool: HUNTER_DOMAIN_SEARCH

Example prompt:

"Find all executive email addresses at stripe.com using Hunter"

Key parameters:

• domain -- Domain to search (e.g., "stripe.com"). Required if company not provided.
• company -- Company name to search (e.g., "Stripe"). Required if domain not provided.
• type -- Filter by "personal" or "generic" emails
• seniority -- Filter by levels: "junior", "senior", "executive" (array)
• department -- Filter by departments: "executive", "it", "finance", "sales", etc. (array)
• required_field -- Require specific fields: "full_name", "position", "phone_number" (array)
• limit -- Max results per request (1-100, default 10; free/basic plans limited to 10)
• offset -- Skip results for pagination (default 0)

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2. Find a Specific Person's Email

Infer the most likely email address for a person given their name and domain or company.

Tool: HUNTER_EMAIL_FINDER

Example prompt:

"Find the email for Alexis Ohanian at reddit.com using Hunter"

Key parameters:

• domain -- Target domain (e.g., "reddit.com"). Takes precedence over company.
• company -- Company name (e.g., "Reddit"). Used if domain not provided.
• Name (one of these combinations required):
  • first_name + last_name (e.g., "Alexis" + "Ohanian")
  • full_name (e.g., "Alexis Ohanian")
• max_duration -- Max request duration in seconds (3-20, default 10). Longer durations yield more accurate results.

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3. Verify Email Deliverability

Check whether an email address is valid, deliverable, and safe to send to.

Tool: HUNTER_EMAIL_VERIFIER

Example prompt:

"Verify if john.doe@example.com is a valid email address"

Key parameters:

• email (required) -- The email address to verify (e.g., "john.doe@example.com")

Response includes: verification status, deliverability score, MX record validation, and risk assessment.

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4. Get Email Volume Estimates

Check how many email addresses Hunter has for a domain or company -- this call is free and does not consume API credits.

Tool: HUNTER_EMAIL_COUNT

Example prompt:

"How many email addresses does Hunter have for stripe.com?"

Key parameters:

• domain -- Domain to query (e.g., "stripe.com"). Required if company not provided.
• company -- Company name (min 3 characters). Required if domain not provided.
• type -- Filter count by "personal" or "generic" emails

Returns: Total count with breakdowns by type, department, and seniority level.

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5. Save and Manage Leads

Create or update leads by email in a single upsert call -- no need to check existence first.

Tool: HUNTER_UPSERT_LEAD

Example prompt:

"Save john@stripe.com as a lead in Hunter with name John Doe, position CTO"

Key parameters:

• email -- Lead's email address (primary identifier for upsert)
• Name, position, company, and other lead metadata

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6. Check Account Usage and Limits

Review your Hunter account plan details, remaining searches, and verification quotas before running bulk operations.

Tool: HUNTER_ACCOUNT_INFORMATION

Example prompt:

"How many Hunter API searches do I have left this month?"

Key parameters: None required.

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Known Pitfalls

• HTTP 401 means invalid credentials: authentication_failed errors indicate an invalid or expired API key. Fix before attempting bulk operations.
• Email counts are estimates: HUNTER_EMAIL_COUNT returns approximate numbers for sizing and prioritization, not guaranteed retrievable email counts.
• Domain search uses offset pagination: HUNTER_DOMAIN_SEARCH paginates via limit/offset. Do not assume the first page is complete -- continue fetching until results are empty or you hit a cap.
• Empty results are not errors: HUNTER_DOMAIN_SEARCH can return emails: [] with no error. Treat as "no data found" and continue, rather than retrying as a failure.
• Verification status nuances: accept_all or risky statuses from HUNTER_EMAIL_VERIFIER indicate uncertainty. Exclude these from strict deliverability workflows or handle them separately.
• Free/basic plan limits: Free and basic plans limit HUNTER_DOMAIN_SEARCH to 10 results per request. Higher limits require a paid plan.
• Domain format matters: Use bare domains like "stripe.com" -- do not include protocol ("https://") or "www." prefix.

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Quick Reference

Action	Tool Slug	Required Params
Search domain emails	HUNTER_DOMAIN_SEARCH	domain or company
Find person's email	HUNTER_EMAIL_FINDER	Name + (domain or company)
Verify email	HUNTER_EMAIL_VERIFIER	email
Get email count	HUNTER_EMAIL_COUNT	domain or company
Save/update lead	HUNTER_UPSERT_LEAD	email
Check account	HUNTER_ACCOUNT_INFORMATION	None

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