ConvertKit email verification
Verify emails before you import to ConvertKit
ConvertKit (Kit) bills you per subscriber and judges you on bounce rate. Verify every address with Verifly before it enters your account so you protect deliverability, dodge bounce warnings, and stop paying for subscribers who were never real.
curl -X POST "https://verifly.email/api/v1/verify/batch" \
-H "Authorization: Bearer vf_your_api_key" \
-H "Content-Type: application/json" \
-d '{"emails":["a@example.com","b@example.com"]}'Real-time SMTP mailbox checks
Single, batch, and async bulk verification
Disposable, role account, and catch-all detection
Pay-as-you-go credits with no subscription lock-in
Search fit
Built for ConvertKit list hygiene and verification
Use Verifly when you need a simple API, predictable pricing, and clean JSON results before emails hit your product, CRM, or campaign tool.
Why ConvertKit lists need a verification pass
ConvertKit's pricing is per subscriber, so every fake, mistyped, or long-dead address on your list is money you pay each month for zero engagement. Worse, those addresses hurt you twice: they inflate your bill and they bounce. ConvertKit watches bounce and complaint rates closely, and a bad import can trigger deliverability warnings or throttling that suppresses the emails your real subscribers should be getting.
The riskiest moment is import. When you bring in a list gathered from a lead magnet, a webinar, an old spreadsheet, or a form outside ConvertKit, you have no idea how many addresses are still live. Import them raw and you can tank your reputation on the very first broadcast.
Verifly lets you verify the whole list before it ever touches ConvertKit. Send the addresses to the batch endpoint, keep only the deliverable ones, and import a clean file. Disposable and role flags let you strip throwaway domains and generic info@ / sales@ addresses that never engage.
Verify a list before ConvertKit import
- Export or assemble the emails you plan to import as a plain list or CSV column.
- Get a free Verifly key at verifly.email/api/v1/autonomous/register — 100 credits, no card, no captcha.
- POST the addresses to /verify/batch and wait for results (large lists run async).
- Keep rows where result is deliverable; drop undeliverable ones and decide per campaign on risky / catch-all.
- Import only the clean file into ConvertKit, then run your sequence or broadcast with confidence.
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)
.map(r => r.email)
console.log(`Importing ${importable.length} of ${results.length} subscribers`)FAQ
Frequently asked questions
Doesn't ConvertKit already remove bad emails?
ConvertKit reacts to bounces after you send — meaning the damage to your reputation is already done. Verifying before import prevents the bounce in the first place, which is far safer than cleaning up afterward.
Will verifying lower my ConvertKit bill?
Yes, indirectly. Because ConvertKit charges per subscriber, removing fake and dead addresses before import means you never pay for them. On a large stale list, that saving can be substantial.
Should I verify addresses from ConvertKit's own forms?
Double opt-in forms are relatively clean, but single opt-in forms and any list imported from outside ConvertKit are the high-risk sources. Those are the ones worth running through Verifly first.
What happens to role addresses like info@?
Verifly flags role addresses separately. They rarely engage and often trigger complaints, so many senders exclude them from ConvertKit imports to keep engagement rates and deliverability high.
How large a list can I verify at once?
Verifly's async bulk pipeline handles lists up to 1,000,000 addresses in a single job, so even a big legacy list can be cleaned before you migrate it into ConvertKit.
What does it cost to clean a ConvertKit list?
Pricing is pay-as-you-go from $2 per 1,000 checks down to $0.60 per 1,000 at volume, with 100 free credits and no subscription. Cleaning a list once is a one-time cost that keeps paying you back in avoided subscriber fees.