Verify Webflow form submissions

Webflow forms collect emails but don't verify them

Webflow gives designers a fast path from layout to live form, and that form's email field does exactly one check: it confirms the value roughly looks like an address. It has no idea whether the mailbox exists. So a Webflow contact form, newsletter box, or gated-download form will happily capture "hi@gmial.com" and "nope@mailinator.com" and pass both straight into whatever the form is connected to.

Because Webflow forms usually feed something automated — a CRM via native integration, an email tool via Zapier or Make, or a webhook to your own backend — those bad addresses don't get a human review. They flow directly into sequences and lists, where they bounce, drag down your sender reputation, and quietly clutter your pipeline with leads you can never reach.

Since Webflow doesn't run server code for form logic, the fix is to insert a verification step in the automation layer. Point your Webflow form submission at a Make or Zapier scenario, or a small serverless function, call Verifly there, and branch on the verdict before the data reaches its final destination.

Add Verifly between Webflow and your CRM

1. In Webflow, set your form to POST to a webhook, or connect it to a Make/Zapier scenario that triggers on new submissions.
2. Get a free Verifly key at verifly.email/api/v1/autonomous/register — 100 credits, no card, no captcha.
3. In the serverless function or automation step, take the submitted email and call Verifly's verify endpoint.
4. If the result is deliverable, continue the flow into your CRM or email tool. If not, stop the sync or route it to a review path.
5. Optionally record the flags (disposable, role) so downstream tools can filter on them.

export default async function handler(req, res) {
  // Webflow posts form data as name/value fields
  const email = req.body.data?.Email || req.body.data?.email

  const vf = await fetch(
    `https://verifly.email/api/v1/verify?email=${encodeURIComponent(email)}`,
    { headers: { Authorization: 'Bearer vf_your_api_key' } }
  )
  const { result, disposable } = await vf.json()

  if (result === 'deliverable' && !disposable) {
    // forward to CRM / ESP
    return res.status(200).json({ forwarded: true })
  }
  res.status(200).json({ forwarded: false, result })
}