Reviewing a sales contact
Use catch-all evidence to decide whether another confirmation method is needed.
SMTP domain diagnostic
Catch-all email checker
Test whether a domain appears to accept mail for arbitrary addresses. We only label a domain catch-all when a randomly generated address is actually accepted.
Some mail providers block or obscure SMTP probes. In those cases the result remains unknown rather than being guessed.
—catch-all result
What is a catch-all email domain?
A catch-all domain accepts messages addressed to names that may not correspond to a real inbox. That makes mailbox-level verification less certain because the receiving server can accept both genuine and invented recipients.
How this test works
EmailValidly first checks the address and mail routing. When the target mailbox is accepted, it generates a random recipient at the same domain and asks the receiving server whether that address would also be accepted. If the random address is accepted, the domain is flagged as catch-all. If the random address is rejected, it is reported as not catch-all. Policy blocks and timeouts remain unknown.
Put the result to work
Understand why server acceptance can be ambiguous
A catch-all server may accept mail for recipients that were never created. This tool requests a recipient probe and, when the probe permits it, a random-recipient check to look for that behaviour.
Check a supplied address
The domain alone is not enough for this form.
Inspect the catch-all field
Detected, not detected and unknown are three different outcomes.
Keep uncertainty visible
A random recipient being accepted prevents a strong claim that the submitted mailbox exists.
Worked examples
What the evidence tells you
Illustrative scenarios, not live results for the addresses or records shown. Open a scenario to see the next action.
01Random recipient accepted
Catch-all detected
The server accepted a made-up local part during the test.
Next action Review the address before relying on it.
02Random recipient rejected
Catch-all not detected
The server distinguished the random recipient in this probe.
Next action Read the submitted mailbox result too.
03Recipient probe blocked
Catch-all unknown
The required evidence was not available; the random probe may not have run.
Next action Do not label the domain as catch-all or non-catch-all.
Use it with a purpose
Where this tool fits
Explaining bulk uncertainty
Investigate why an address has usable DNS but no conclusive mailbox status.
Before you decide
Questions about this tool
Is a catch-all address invalid?
Not necessarily. Some domains deliberately accept all recipients.
Can a server accept the probe and bounce later?
Yes. Acceptance during a probe is not a guarantee of final delivery.
Why is catch-all unknown?
Probes can be blocked, time out or stop before a random-recipient test can be attempted.
