iCloud
Fastmail
AOL
T-Online
Libero
163
Naver
UOL
Outlook
Proton Mail
Tuta
GMX
Orange
Seznam
Rambler
126
Daum
Terra
Yahoo
Zoho Mail
Mail.com
WEB.DE
Free
QQ Mail
Sina Mail
Rediffmail
BT
Gmail
gmail.com · googlemail.com
DeliverabilityAvatar URL
Real-time email deliverability check
Check any email in real time — and find out if it can still receive mail
Drop the addresses that would bounce before you send: typos, closed accounts, addresses that were never real. No provider list to check against — corporate domains and small regional mailboxes work the same way.
- Any mailbox provider, any domain — one product, one price
- Answered in about a second, straight from the provider
- Nothing is ever sent to the address — the person never knows
- Undetermined checks are refunded; we never pass off a guess
Real-time checks work with virtually every mailbox
The providers our customers check most often — not a whitelist. Domains that are not listed work just the same, including corporate and small regional mailboxes.
These domains also return an avatar URL
For the domains below, run the avatar check instead and the response carries two more fields alongside the deliverability result: avatar (whether there is one) and avatar_url (the image address). Other domains have no avatar to fetch — an avatar check on them is rejected before it is billed, not charged and returned empty.
Yandex
yandex.ru · yandex.com · ya.ru · yandex.by · yandex.kz · yandex.ua · yandex.com.tr · narod.ru
DeliverabilityAvatar URL
Mail.ru
mail.ru · inbox.ru · bk.ru · list.ru · internet.ru
DeliverabilityAvatar URL
Connect email checks to your workflow
Check an address during sign-up, form submission, or contact import, then use the result to decide what happens next.
curl https://emailcheckpro.com/api/v1/check \
-H "X-API-Key: sk_live_..." \
-H "Content-Type: application/json" \
-d '{"service_type":"email","identifier":"example@gmail.com"}'
{
"service_type": "email",
"identifier": "example@gmail.com",
"registered": true
}
email_avatarbatch-check · up to 100
100 addresses, one response
The synchronous multi-address endpoint takes up to 100 addresses per request and still answers in that same HTTP response. It is not an async task, so there is no task id to poll.
Limits and concurrencyThe key set never changes
An undeliverable address returns the same keys with false and an empty string. Parse one shape — no separate branch for the negative case.
Response fieldsMCP, same API key
Point Claude, Cursor or any MCP client at your account and it runs the same checks from a chat, against the same balance.
MCP setup
Email Infrastructure Strategy: Separating Your Sending StreamsLearn email infrastructure best practices for separating sending streams and using registration signals to inform data hygiene workflows.Read article
Why Client-Side Email Validation Isn't Enough: Moving to Service-Layer VerificationDiscover why client-side checks fail and how a service-layer email verification workflow protects data integrity across web, API, and batch entry points.Read article
Beyond Built-in Mail: Why Transactional Email Infrastructure Needs a Dedicated StrategyExplore why modern transactional email infrastructure requires dedicated delivery strategies and real-time registration signals for data hygiene.Read article
Beyond Autonomous SDRs: Building Reliable AI Outreach Workflows with Real-Time DataLearn how to ground AI-driven email outreach workflows with real-time registration checks to inform list hygiene and support human-led strategy.Read article
The Seasonal Outreach Myth: Why Data Quality Matters More Than TimingDiscover why email outreach data quality matters more than seasonal timing. Learn how real-time registration checks support list hygiene.Read article
The Pre-Call Data Audit: How to Verify Lead Identity and Contact Data Before Your MeetingLearn how lead data verification supports pre-call research by checking provider registration status, avatar signals, and catch-all domain records.Read articleFrequently asked questions
The things people ask before their first send.
Is the check real time?
Yes. Once an address is submitted the result comes back in the same HTTP response — no task queue, no polling — in about a second for one address. It reports the state at the moment of the check, so run it again whenever you need a current answer.
Does a valid result guarantee the mail arrives?
No. The check answers whether the address exists and is still in use at its provider — it catches typos, closed accounts and addresses that were never real, which is where most bounces come from. Whether the message then lands in the inbox or in spam depends on your sending domain reputation and your content, not on this step.
Does the check send mail to the address?
No. Checks run against the provider's own account lookups. The person behind the address receives nothing, and no message is queued on your behalf.
Which domains can return an avatar?
The avatar check covers the Gmail, Yandex and Mail.ru domains. Everything else — including Outlook, Yahoo and iCloud — is rejected before it is billed, rather than charged and returned empty. The deliverability check itself has no domain restriction; any address works.
What do catch-all domains return?
Undetermined. They accept every address, so there is nothing to confirm either way. Undetermined checks are refunded, not guessed.
Put this step in front of your sends
Create an account and contact support for 100 free checks, usable on any product. After that you pay per check — balance never expires and nothing auto-renews.