Validate emails before HubSpot import

Bad contacts cost more than a bounce in HubSpot

In HubSpot, an email address isn't just a field — it's the key that drives lifecycle stages, workflow enrollment, list membership, and marketing-email sends. So an invalid contact doesn't just bounce once; it enrolls in nurture workflows, counts toward your marketing-contacts tier, and drags down the deliverability of every marketing email HubSpot sends on your behalf. HubSpot actively watches hard-bounce rates and will suppress addresses, but by then the reputation damage to your connected sending domain is already done.

The two doors bad emails come through are bulk CSV imports and form submissions. A quarterly list import from a trade show or a partner drops hundreds of stale addresses in at once; public forms let anyone type a typo or a throwaway domain. Both are far cheaper to filter before HubSpot creates the contact than to clean up after workflows have already fired.

Verifly runs the check in that gap. Verify a CSV before you import it, or call the API from a form-handler or workflow webhook before the contact is created, and only real mailboxes ever become HubSpot contacts. Because you count marketing contacts, keeping junk out also keeps you off the next pricing tier.

How to verify contacts before they hit HubSpot

1. For bulk cleanup, export or assemble the contact CSV and pull the email column.
2. Get a free Verifly key at verifly.email/api/v1/autonomous/register (100 credits).
3. POST the email column to /verify/batch; for very large imports the async bulk pipeline handles up to 1,000,000 addresses.
4. Keep only rows where result is deliverable, and drop disposable and role addresses. Then run HubSpot's import on the cleaned file.
5. For real-time forms, call GET /verify from your form handler (or a workflow webhook action) and only create the HubSpot contact when the address is deliverable.

import fs from 'node:fs'

const emails = fs.readFileSync('hubspot_import.csv', 'utf8')
  .split('\n').slice(1)               // skip header
  .map(row => row.split(',')[0].trim()) // email is column 1
  .filter(e => e.includes('@'))

const res = await fetch('https://verifly.email/api/v1/verify/batch', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer vf_your_api_key',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ emails }),
})

const { results } = await res.json()
const importable = results.filter(
  r => r.result === 'deliverable' && !r.disposable && !r.role
)
console.log(`Import ${importable.length} contacts into HubSpot`)