Question 1

What is a catch-all email checker?

Accepted Answer

A catch-all checker looks at a domain's mail configuration to work out whether it accepts mail for every possible address. On catch-all domains an SMTP verification can never confirm a single mailbox, so those addresses must be treated as unknown rather than valid.

Question 2

How do I know if an email is catch-all?

Accepted Answer

Check the domain with an address that cannot exist. If the receiving server accepts it, the domain is catch-all. DebounceNow surfaces the MX configuration and provider so you can see how the domain behaves before spending credits.

Question 3

Are catch-all email addresses valid?

Accepted Answer

The domain is valid and reachable, but the individual mailbox is unproven. Some catch-all addresses deliver perfectly; others silently drop or bounce later, which is why they belong in their own segment.

Question 4

Should I email catch-all addresses?

Accepted Answer

Yes, carefully. Send from a warmed domain in small batches, monitor bounces per domain and suppress the domain if the segment bounces hard. Never mix catch-all addresses into a large cold blast.

Question 5

Why do verification tools return accept-all?

Accepted Answer

Because the receiving server answers yes to every recipient, a positive SMTP response proves nothing. Honest tools report accept-all or unknown instead of claiming the mailbox is valid.

Question 6

Is the catch-all checker free?

Accepted Answer

The domain, MX and provider analysis is free and unlimited. Only SMTP-level verification of the surviving addresses uses credits.

Catch-all email checker

Why catch-all exists

What it means for your list

How to send safely

Read the full explanation

Catch-all email FAQ