CheckNumber.AI 
Email Validation
email_check $7 per 10,000 emails
- Core data available
- email, activated
- Best for
- Pre-send list cleaning across supported providers
No-code CSV REST API Exportable results
Validate Email Registration Across Major Providers
Check whether email addresses are registered on Outlook, Gmail, Yahoo, Mail.ru, or iCloud.
CheckNumber's email validation checks whether each email address is registered on supported major providers — Gmail, Outlook, Yahoo, Mail.ru, and iCloud — without sending an email. Upload a CSV of addresses or call the REST API, and every row returns the submitted email with an active or inactive result for list cleaning and pre-send review.
5
Major providers
$7
Per 10,000 emails
CSV + API
Workflow
Email name@••••.com
Registration status active / inactive
Email Validation No account, number, or SIM required
Every check runs through official platform APIs on our own infrastructure. You never connect, bind, or use your own account, phone number, or SIM card — just upload your list or call the API and get results.
What CheckNumber detects for Email Validation
Mailbox active status
Returns whether the email is registered and active on its provider (true or false), so you can drop dead addresses before sending.
Supported provider coverage
Checks registration for addresses handled by Gmail, Outlook, Yahoo, Mail.ru, and iCloud.
Bulk verdict
Every address comes back with a clear result, ready to filter and segment.
Passive, no contact
No email is ever sent. The check reads registration signals only and never notifies the mailbox owner.
What You Can Check
Validate provider registration without sending email
The batch task keeps the original address beside its active or inactive registration result across the supported providers.
| Validation product | Task type | Input | Core data available | Best for | Current price |
|---|---|---|---|---|---|
| Email Validation API documentation | email_check | Email addresses | email, activated | Pre-send list cleaning across supported providers | $7 per 10,000 emails |
Common Use Case
Improve Email Validation list quality before outreach
Improve email deliverability and cut bounce rates before a campaign send.
No-code CSV REST API Exportable results
Signal 1
Mailbox validation — confirm in bulk whether each email is a real, registered address.
Signal 2
Major-provider coverage — validate addresses handled by Gmail, Outlook, Yahoo, Mail.ru, or iCloud.
Signal 3
Privacy-safe — a passive check that never sends an email or notifies the owner.
Email Validation FAQ
Which email providers can you validate?
The current product supports Gmail, Outlook, Yahoo, Mail.ru, and iCloud addresses.
Does validating an email send it a message?
No. The check is passive and never sends an email or notifies the mailbox owner.
Can I validate emails in bulk?
Yes. Upload a CSV of email addresses or call the REST API, then download a result file per address. You are billed only for successful checks.
Is there a free trial?
Yes. New accounts receive 1,000 free checks on signup with no credit card, and every check is pay-as-you-go with no monthly fee, and the credits you top up never expire.
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10%
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