How to find and verify work emails for a HubSpot prospect list using Apollo and Hunter

Why find and verify emails?

Outbound teams spend 15-20 minutes per prospect researching and verifying contact information. For a list of 200 trade show leads, that's 50+ hours of manual work before a single email is sent. Meanwhile, speed-to-contact data shows that reaching out within 24 hours of acquiring a lead produces 3-5x higher response rates than waiting a week.

The bigger problem is data quality. Email finder tools have ~85-90% accuracy. Sending to invalid addresses damages your sender reputation — ISPs track your bounce rate, and once it exceeds 2-3%, your entire domain can land in spam folders. Verification before outreach is not optional.

This workflow finds verified work emails automatically:

• Searches Apollo for work emails using name + company domain
• Verifies each email's deliverability via Hunter before writing it to HubSpot
• Skips Hunter for Apollo-verified emails to save credits (typically 30-40% of results)
• Flags unverifiable contacts for manual review instead of discarding them

What you'll need

How it works

Every approach follows the same pattern:

1. Find — search HubSpot for contacts that have a name and company but no email address
2. Look up — send the name + company to Apollo's People Match API, which returns a candidate email and confidence level
3. Verify — if Apollo already confirmed the email, skip this step. Otherwise, check deliverability with Hunter's Email Verifier API
4. Write back — update the HubSpot contact with the verified email, source attribution, and verification status

The approaches differ in how they're triggered (real-time vs. scheduled vs. on-demand), how they handle the Apollo→Hunter→HubSpot chain, and what they cost per contact.

Which approach should I use?

• n8n (recommended) — best balance of cost and control. Visual workflow with built-in branching for the verification logic. Self-hosted is free; cloud starts at $24/mo.
• Zapier — simplest to configure if you're already on Zapier, but task costs add up fast. Each contact uses 5-7 tasks through the loop. Professional plan ($29.99/mo) handles ~100-150 contacts/month before exceeding limits.
• Make — lowest per-contact cost among no-code tools. Router modules handle the Apollo-verified vs. needs-Hunter branching cleanly. Free plan covers ~166-250 contacts/month.
• Code + Cron — zero platform cost. Full control over rate limiting, error handling, and batch sizing. Best for teams processing 100+ contacts per run.
• Claude Code — conversational email finding with no fixed code. Ask "find emails for the trade show list" or "verify the contacts imported yesterday" and the agent adapts. Best for ad-hoc list processing and teams already using Claude Code.

Choose your approach

Select an approach below to see the full step-by-step guide.