Bulk Email Verification API
Process thousands of email addresses in a single request with EmailVerify.io's bulk email verification API. Submit a batch of up to 5,000 addresses, receive a task_id immediately, and retrieve fully categorized results — valid, invalid, catch-all, and risky — once verification completes. Purpose-built for teams that need to clean large lists without blocking their application.
100 free credits · no credit card required · replenishes monthly
Submit, Validate, Retrieve — Async Batch Verification
The bulk email validation API is designed for large-scale async processing. Submit once, poll for progress, retrieve structured results.
Submit Your Batch
POST up to 5,000 email addresses in a JSON array. The API immediately returns a task_id and count_submitted — no waiting.
Validate in the Background
Each address runs through the same syntax, MX, blacklist, and SMTP checks as the real-time API. Progress is trackable at any time.
Retrieve Categorized Results
When status reaches 'verified', fetch per-address status and sub_status. Export or segment the clean list for your next campaign.
Why Teams Choose Our Bulk Email Validation API
Everything needed to clean, segment, and act on large email lists — from a single API endpoint.
Up to 5,000 Emails per Batch
Submit large lists in one POST request without pagination or complex orchestration.
Async Processing with Progress Tracking
A task_id and progress_percentage let you poll at your own rate and process results as they arrive.
Full Multi-Layer Verification
Every address passes the same syntax, MX, blacklist, and SMTP checks as the single-address API.
Categorized, Exportable Results
Each result includes status and sub_status so you can segment valid, catch-all, risky, and invalid addresses separately.
Dashboard Upload Formats
Upload CSV, XLS, XLSX, or TXT files directly through the dashboard, or import from Google Drive, Dropbox, and OneDrive.
Same API Key, Shared Credits
One API key covers all three EmailVerify.io APIs. Credits are pooled and replenish monthly.
Integrate the Bulk Verification API in Your Stack
Call the /validate-batch endpoint directly or use an official SDK for Python, Node.js, PHP, Ruby, Golang, .NET / C#.
import requests
payload = {
"key": "YOUR_API_KEY",
"title": "My Campaign",
"email_batch": [{"address": e} for e in email_list]
}
resp = requests.post("https://app.emailverify.io/api/v1/validate-batch", json=payload)
task_id = resp.json()["task_id"]
Where the Bulk Verification API Pays Off
Pre-Campaign List Cleaning
Scrub a list before a send to cut hard bounces, protect sender reputation, and keep deliverability high.
CRM Import Hygiene
Validate contacts in bulk as they flow into your CRM from lead forms, trade shows, or data purchases.
Legacy List Reactivation
Re-verify dormant contacts before re-engaging them to avoid bounces and spam complaints on aged lists.
Data Enrichment Pipelines
Integrate batch verification into ETL workflows to keep email data fresh and deliverable at scale.
Try the Free Bulk Email Verification API
Sign up for a free account and receive 100 verification credits with no credit card required. Credits replenish monthly and work across all three APIs. Use your free allowance to test batch submissions, evaluate accuracy, and validate your integration before upgrading.
EmailVerify.io vs NeverBounce vs ZeroBounce
Start strong: $20/month for 30,000 verifications — up to 10× more emails than others per dollar.
| Verifications / month | EmailVerify.io | NeverBounce | ZeroBounce |
|---|---|---|---|
| 30,000 credits | $20 | $150 | $210 |
| 60,000 credits | $40 | $300 | $420 |
| 120,000 credits | $80 | $480 | $468 |
| 180,000 credits | $115 | $720 | $702 |
Get Started in 3 Steps
Start verifying emails in minutes with 100 free credits, no credit card required.
Create Free Account
Sign up and get instant access to your dashboard and API credentials.
Get Your API Key
Access your unique API key from your dashboard and start making requests immediately.
Make Your First Request
Call the API endpoint with your key and start verifying emails using your 100 free credits.
Ready to get started?
Get 100 free verification credits and 10 email finder queries when you sign up today. All credits replenish monthly.
Frequently Asked Questions
What is a bulk email verification API?
A bulk email verification API lets you validate many email addresses in a single request instead of one at a time. EmailVerify.io's bulk email validation API accepts a batch of up to 5,000 addresses, returns a task_id, then verifies each address with regex, MX, blacklist, and SMTP checks so you can clean entire lists programmatically.
How many emails can I verify in one batch?
You can submit up to 5,000 email addresses in a single POST request to the bulk email verification API. For larger lists, send multiple batches and poll each task_id for results.
How long does bulk email verification take?
Processing is asynchronous. After you submit a batch you receive a task_id immediately, then poll the results endpoint, which reports a progress_percentage until the task status becomes verified. Time depends on list size and the responsiveness of the receiving mail servers.
Is there a free bulk email verification API?
Yes. Every account starts with 100 free verification credits, no credit card required, replenished monthly. Because one credit verifies one email, you can test the free bulk email verification API on a small batch before scaling up.
What file formats are supported for bulk email verification?
The API itself accepts a JSON batch of email addresses. In the EmailVerify.io dashboard you can also upload lists as CSV, XLS, XLSX, or TXT, and import from Google Drive, Dropbox, or OneDrive, then download cleaned, categorized results.
How do I retrieve bulk verification results?
Submit your batch by POSTing to /validate-batch to receive a task_id. Then send a GET request to /get-result-bulk-verification-task/ with your key and task_id to retrieve the status, progress_percentage, and per-address results including status and sub_status.