A verified email is an address that has been checked, live, against the receiving mail server and confirmed able to accept mail — in other words, marked deliverable. It is not simply an address in the right format, and it is not a guess based on a naming pattern. At AdaptLeads, only emails verified as deliverable are ever exported.
That distinction matters because the word “verified” gets stretched. Some providers call an address verified when all they've really done is confirm it looks like an email. Others sell guessed or catch-all addresses under the same label. None of that tells you whether a message will actually land — and getting it wrong quietly damages your sending domain.
What email verification actually checks
Real verification is a live check against the mail server that receives the address, not a look at the text of the address itself. It happens in layers:
- Syntax — is the address well-formed (name@domain.tld)? This is the weakest signal; it only proves someone typed it correctly.
- Domain and MX — does the domain exist, and does it have mail servers set up to receive email?
- Mailbox — the important part. Verification opens a conversation with the receiving server and asks whether that specific mailbox exists and will accept mail, without actually sending anything.
Only that last step tells you an address is real. Everything before it can pass while the mailbox itself is dead. A verified email is one that clears all three — and the mail server confirmed the mailbox will accept mail.
The four outcomes explained
A live check doesn't just return “yes” or “no”. It returns a status, and each status means something different for whether you should send to it.
| Outcome | What it means | Do we export it? |
|---|---|---|
| Deliverable | The mail server confirmed the mailbox exists and can accept mail. | Yes — this is what “verified” means. |
| Risky | The server gave a cautionary or inconclusive response, for example a full mailbox or a temporary block. | No — held back, never sold as verified. |
| Catch-all | The domain accepts mail to any address, so the individual mailbox can't be confirmed. | No — never sold as verified. |
| Undeliverable | The server rejected the address, or the mailbox doesn't exist. | No — suppressed. |
We keep every one of these on record and label it honestly, so nothing is thrown away — but only deliverable addresses can be exported.
Why a catch-all is not the same as verified
A catch-all domain is configured to accept mail sent to any address at that domain, including ones that were never created. If you ask the server whether anything@company.co.uk exists, it says yes — to everything.
That's the problem. Because the server accepts all addresses, it can't confirm that the specific mailbox you care about is real. The address might reach a person, or it might land nowhere, or it might hit an unmonitored inbox that quietly bins it. A catch-all result is genuinely unknown, so calling it “verified” would be dishonest. We label catch-alls as exactly that and never export them as verified.
Why guessed or pattern emails are dangerous for your sending domain
It's tempting to fill gaps by guessing — take a person's name and a company domain and assume firstname.lastname@company.co.uk. Some of those guesses will be right. Many won't, and the wrong ones cost you far more than the right ones save.
- Bounces. Guessed addresses that don't exist bounce. A high bounce rate tells mailbox providers you don't know who you're emailing, and your inbox placement drops for everyone on the list.
- Spam traps. Some invalid or recycled addresses are spam traps. Hitting one can get your domain flagged or blocklisted.
- Sender reputation. Bounces and complaints compound. Once your reputation slips, even your good mail starts landing in spam — and reputation is slow and painful to rebuild.
This is why we never sell a guessed address as verified. A guess is a guess, and sending to guesses is how good sending domains get quietly wrecked.
How AdaptLeads handles it
Our rule is simple: only deliverable emails can be exported. We check every email against the receiving mail server, label it deliverable, risky, catch-all or undeliverable, and hold everything except deliverable back from export. Catch-all and guessed addresses are never dressed up as verified.
Everything else is still kept and graded, so you always see what's on file. A record's quality grade (1–5★) reflects what's actually been proven about it — a 5★ record is a registered company with a named director and a verified email. Our enrichment engine re-checks companies and re-verifies emails continuously, so a status is never left to go stale for long. You can read more about how our data is built and verified, and about how pricing works — search is unlimited, and you only spend an export on a contact you can actually use.
How to check before you send
Whatever list you're working from, a few habits keep your sending safe:
- Re-verify the list right before you send, especially if it's more than a few weeks old.
- Send only to addresses marked deliverable. Drop risky, catch-all and unknown.
- Get your own authentication in order: SPF, DKIM and DMARC on your sending domain.
- Warm up a new domain and mailbox before sending at any volume.
- Start small, watch your bounce rate, and stop if it climbs.