catch all email domain check
Catch all email domain check
Check whether a domain uses permissive mailbox handling before you trust the result.
Catch-all detection is a deliverability signal, not a guarantee.
It helps explain why a mailbox may appear reachable even when it is not individually confirmed.
It is most useful in higher-volume or higher-risk workflows.
220 mail.example.com ESMTP
EHLO emailverify.se
MAIL FROM:<[email protected]>
RCPT TO:<[email protected]>
QUITHow to read it
Treat catch-all as a warning and compare it with other risk signals.
When to escalate
Escalate to SMTP or manual review when a high-value lead looks risky.
Why catch-all is a risk signal
Catch-all servers accept many or all local parts, so a positive response does not strongly prove mailbox existence. That makes them useful for risk scoring but weak as a yes/no proof of deliverability.
How teams should treat it
The right response is usually to downgrade confidence, not immediately reject. High-value signups can be escalated to extra review or a stronger verification path, while low-value signups can be handled more strictly.
FAQ
How do I use this page?
Use it as a quickstart reference and link it from your docs, onboarding flow, or marketing page.
What should I do next?
Create an account, try the demo, and move the integration into your backend with a real API key.
Is catch-all the same as invalid?
No. It is usually valid, just less certain.
Why does it matter for onboarding?
Because it changes how much trust you should place in the address result.