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.
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.