bulk email checker
for clean lists
Upload your email list and verify thousands of addresses in minutes. Our bulk email checker uses real SMTP verification to tell you exactly which emails are valid, risky, or dead.
How bulk email checking works
Four steps from upload to clean list. Most lists finish processing in under 5 minutes.
Upload your list
Drag and drop a CSV or Excel file with your email addresses. We auto-detect the email column.
We verify every email
Each email goes through syntax, MX, disposable, and SMTP checks. Processed in parallel for speed.
Review & filter results
Browse results by status: valid, risky, or invalid. See deliverability scores and quality grades for each email.
Export clean list
Download your verified email list as CSV. Export all results or filter to only valid addresses.
Why use a bulk email checker?
Sending to unchecked lists wastes money and damages your domain. Here's what bulk email checking does for you.
Protect sender reputation
High bounce rates damage your domain reputation. Bulk checking removes invalid addresses before you send, keeping bounce rates under 2%.
Improve deliverability
Clean email lists mean more emails land in the inbox. Remove disposable, role-based, and non-existent addresses that hurt your campaigns.
Save money on sends
Stop paying to send emails that bounce. Every ESP charges per email. Removing 10-20% of invalid addresses directly cuts your sending costs.
Get accurate metrics
Invalid emails skew your open rates and click rates. Clean lists give you real engagement data to make better marketing decisions.
Supported file formats
Upload your email list in any of these formats. We auto-detect the email column.
.CSV
Comma-separated values. The most common format for email exports from CRMs and ESPs.
.XLS
Classic Excel format. Works with exports from older spreadsheet applications and legacy systems.
.XLSX
Modern Excel format. The default for Excel, Google Sheets exports, and most modern tools.
Live API Playground
Test the API with real validation. Every request hits our live infrastructure.
-H "Authorization: Bearer vk_live_..." \
-d '{"email":"dev@company.com"}'
Enter an email and validate to see results
$ ./validate --email user@example.com
Simple pricing
No hidden fees. No enterprise sales calls. Just pay for what you use.
Try it risk-free for 14 days. Full refund if it's not for you.
Starter
- • 5,000 validations/month
- • single API key
- • real SMTP verification
- • validation history
Growth
- • 15,000 validations/month
- • single API key
- • real SMTP verification
- • validation history
- • bulk validation
- • email OTP 2FA (25k/mo)
Pro
- • 50,000 validations/month
- • unlimited API keys
- • duplicate removal
- • webhooks & callbacks
- • email OTP 2FA (50k/mo)
Unlimited
- • unlimited validations
- • all pro features
- • dedicated support
- • fair usage up to 5M/month
- • email OTP 2FA (100k/mo)
Bulk email checker FAQ
How many emails can I check in bulk at once?
Each bulk upload supports up to 1,000 emails per file. You can upload multiple files. Your monthly quota depends on your plan: Growth (15,000/mo), Pro (50,000/mo), or Unlimited (up to 5M/mo).
How long does bulk email checking take?
Most lists are processed within minutes. A 1,000 email list typically completes in 2-3 minutes with full SMTP verification. Emails are processed in parallel batches for speed.
What file formats does the bulk checker accept?
We accept CSV (.csv), Excel (.xls), and modern Excel (.xlsx) files. The bulk checker auto-detects the email column in your file, so no special formatting is needed.
Can I export the bulk check results?
Yes. After processing, you can export results as a CSV file. Filter by status (valid, risky, invalid) before exporting, or download the complete results with all verification details.
Which plan do I need for bulk email checking?
Bulk email checking requires the Growth plan ($19/month) or higher. The Starter plan supports single email verification via the API and playground. All plans include real SMTP verification.
Does the bulk checker remove duplicates?
Automatic duplicate removal is available on the Pro plan ($49/month) and above. On the Growth plan, duplicates are checked but counted toward your monthly quota. You can manually deduplicate before uploading.
Clean your email list today
Start with the Growth plan at $19/month for bulk email checking with SMTP verification.