email-verifier

name	email-verifier
description	Verify email addresses before sending to protect deliverability. Uses Hunter.io verification API. Filters out invalid, disposable, and risky emails.

Email Verifier

Verify emails before loading into Instantly to protect your sender reputation.

What It Does

1. Takes enriched leads with emails
2. Verifies each email via Hunter.io
3. Filters out invalid, disposable, and high-risk emails
4. Returns clean list ready for outreach

Why This Matters

• Bounce rate > 5% = domain reputation damage
• Spam traps = instant blacklist
• Disposable emails = wasted sends
• Accept-all domains = risky but sometimes worth it

Invocation

# Verify all emails
./scripts/verify.sh enriched.json > verified.json

# Strict mode (reject accept-all)
STRICT=true ./scripts/verify.sh enriched.json > verified.json

# Just check one email
./scripts/verify.sh --email "[e-mail]"

Setup

Environment Variables

export HUNTER_API_KEY="your_hunter_api_key"

Verification Statuses

Status	Meaning	Action
valid	Confirmed deliverable	✅ Send
accept_all	Domain accepts any email	⚠️ Send with caution
invalid	Will bounce	❌ Remove
disposable	Temporary email	❌ Remove
webmail	Personal email (gmail, etc)	⚠️ Flag for review
unknown	Can't verify	⚠️ Send with caution

Input Format

Expects leads with email field:

{
  "leads": [
    {
      "name": "Jane Doe",
      "email": "[e-mail]",
      "company": "Acme Corp"
    }
  ]
}

Or from outreach-writer:

{
  "emails": [
    {
      "lead": {
        "name": "Jane Doe",
        "email": "[e-mail]"
      },
      "sequence": [...]
    }
  ]
}

Output Format

{
  "meta": {
    "total": 50,
    "valid": 42,
    "accept_all": 5,
    "invalid": 2,
    "disposable": 1,
    "skipped": 0,
    "verified_at": "2026-02-14T15:00:00Z"
  },
  "leads": [
    {
      "name": "Jane Doe",
      "email": "[e-mail]",
      "email_status": "valid",
      "email_score": 91,
      "safe_to_send": true
    }
  ]

Hunter API Response

{
  "data": {
    "email": "[e-mail]",
    "status": "valid",
    "result": "deliverable",
    "score": 91,
    "regexp": true,
    "gibberish": false,
    "disposable": false,
    "webmail": false,
    "mx_records": true,
    "smtp_server": true,
    "smtp_check": true,
    "accept_all": false,
     
  

Usage in Pipeline

# Full pipeline with verification
./linkedin-miner/scripts/mine.sh "AI marketing" 20 > raw.json
./lead-enricher/scripts/profile-enrich.sh raw.json | \
  ./lead-enricher/scripts/enrich.sh > enriched.json
./icp-scorer/scripts/score.sh enriched.json > scored.json
./outreach-writer/scripts/write.sh scored.json > emails.json
./email-verifier/scripts/verify.sh emails.json > verified.json
./instantly-loader/scripts/load.sh verified.json

Rate Limits

Plan	Verifications/month
Free	50
Starter	500
Growth	2,500
Pro	10,000

Note: Hunter Email Finder Already Verifies

If you used Hunter's Email Finder in lead-enricher, emails are already verified. This skill is for:

• Emails from other sources (Apollo, LinkedIn, manual)
• Re-verification before sending
• Strict compliance requirements