Verify Thousands of Emails Instantly
Upload your CSV email list and receive clean, segmented results with full validation scores, status codes, and risk signals per address. Built for marketers, CRM admins, and growth engineers.
Key Benefits
Upload CSV files with up to 1 million email addresses per batch
Async processing with webhook or polling for job completion status
Results include full validation breakdown: syntax, domain, MX, SMTP, disposable, catch-all
Downloadable results as CSV with clean/risky/invalid segmentation ready for import
Batch job history and analytics dashboard for all past verification runs
Progress tracking via API job status endpoint — no waiting, just poll when ready
Parallel processing engine — 100K emails typically complete in under 30 minutes
Supports Unicode and international domain emails including IDN addresses
Use Cases
CRM Database Cleaning
Export your HubSpot, Salesforce, or Zoho contacts, bulk-verify, then reimport only valid addresses. Reduce CRM costs and improve segmentation quality.
Email Campaign Pre-send
Run your campaign list through ValidoAPI bulk verification before every major send. Protect your sender score and improve open rates overnight.
Cold Email Outreach
Validate Apollo, Lusha, or scraped prospect lists before loading into Lemlist, Instantly, or Woodpecker. Stop wasting outreach credits on dead emails.
Newsletter Subscriber Audit
Periodically clean your subscriber list to remove dead, disposable, and catch-all addresses that drag down your engagement metrics.
Data Enrichment Pipelines
Integrate bulk email verification into your data pipeline via API. Validate emails as part of automated ETL and enrichment workflows.
Lead Scoring Systems
Use ValidoAPI deliverability scores to enrich leads in your CRM with an email quality signal before handing to SDRs.
Example API Response
// Job submission
POST /v1/email/bulk
{ "file_url": "https://...", "callback_url": "https://yourapp.com/webhook" }
// Job status response
{
"job_id": "job_a1b2c3d4",
"status": "processing",
"total": 5000,
"processed": 3421,
"estimated_completion": "2025-01-15T14:23:00Z"
}
// Results summary
{
"job_id": "job_a1b2c3d4",
"status": "completed",
"total": 5000,
"valid": 3812,
"risky": 641,
"invalid": 547,
"download_url": "https://api.validoapi.com/v1/results/job_a1b2c3d4.csv"
}Frequently Asked Questions
How large a CSV can I upload for bulk verification?
ValidoAPI supports bulk files up to 1 million email addresses per job on the Growth and Enterprise plans. The Starter plan does not include bulk CSV upload.
How long does bulk verification take?
100,000 emails typically complete in 20–40 minutes. Processing time depends on the number of SMTP-reachable servers in your list and their response latency.
What columns should my CSV have?
Your CSV needs a minimum of one column containing email addresses. Additional columns (name, company, etc.) are preserved in the results output.
Can I get notified when a bulk job is complete?
Yes. You can provide a webhook URL when submitting the job and receive a POST request with the results URL when processing is complete. You can also poll the job status endpoint.
What format are the results delivered in?
Results are delivered as a CSV download with each original row enriched with status, score, and individual check results for syntax, domain, MX, SMTP, disposable, and catch-all.
Related Services
Start Validating Emails Today
Free plan includes 200 validations/month. No credit card required.
Get Free API Key