Find the bad emails before you send one.
Cleanlist AI asks each address's mail server whether the mailbox exists, sends nothing, and gives every email one of five statuses for half a credit. Then Clu finds the person behind each good one, with name, title, company and phone number.
A demo of email verification in Cleanlist AI. Seven addresses imported from a CSV are validated and each gets one of five statuses: verified, likely valid, risky, invalid or unknown. Clu then asks before enriching the three good addresses, which come back as contacts with name, company and phone number.
10,000+ users, from founders to full sales teams
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ZoomInfo - Case study
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Cleanlist AI asks the mail server. Nothing gets sent.
Three checks run on every address: the spelling, the domain's mail records, then a short exchange with the mail server that ends before anything is sent. If the server also accepts an address that can't exist, the email is marked risky.
Syntax
Catches the typos a bad list is full of: a missing dot, a doubled domain, .cmo where .com should be.
DNS and MX
Cleanlist AI looks up the domain's mail records. A domain with no MX record can't receive mail, so the check stops there.
SMTP handshake
It asks the mail server whether the mailbox exists, then hangs up before anything is sent. A server that says yes to a made-up address gets flagged accept-all.
- Verified
The mail server confirmed the mailbox.
Safe to send
- Likely valid
Strong signals, short of a full confirmation.
Send with care
- Risky
Accept-all domains and role addresses like info@.
Flagged for you to decide
- Invalid
No domain, no MX record, or a disposable inbox.
Kept out of your sends
- Unknown
The server didn't answer in time.
Check again later
Turn an email into a person with a phone number.
Reverse email lookup puts a name, title, company, location, LinkedIn and phone number on each email you already have. Cleanlist AI asks 25+ providers in turn and stops at the first one that confirms.
An example reverse lookup: an email address goes in, and Cleanlist AI returns the person behind it with company, location, LinkedIn profile, a verified work email and a phone number, with the provider in the waterfall that found the phone.
Check every new HubSpot contact before anyone emails it.
Emails go stale as people change jobs. Ask Clu to keep HubSpot deliverable and it builds this agent: every new or edited contact gets checked, verified ones sync back and risky ones go to #revops for a person to decide.
Cleanlist AI verifies every address through a multi-provider waterfall that catches typos, dead domains and catch-all risk, and returns 98% verified work emails on its 500-lead benchmark. Developers run single or bulk verification through the API v2 on Pro and Enterprise, with a signed cost quote before a credit is spent.
- A contact is added or editedHubSpot · checked every 30 minutes
- ValidateVerify email0.5/record
- BranchContinue if Verified or Likely validElse
CRM ActionSync to HubSpot Contact- NotifySlack · #revops · risky ones only
Watch it run
Questions about email verification
Try the free email checkerHow does Cleanlist AI's email verification tool work?
Three checks on every address: syntax, a DNS and MX lookup to confirm the domain takes mail, and an SMTP handshake that asks the mail server whether the mailbox exists. Nothing is sent. Each address gets one of five statuses (verified, likely valid, risky, invalid or unknown), and accept-all domains, disposable inboxes, role addresses like info@ and spam traps are flagged.
What's reverse email lookup? How do I get contact data from just emails?
Reverse email lookup takes an email address and finds the person behind it. Cleanlist AI asks 25+ data providers in turn for that person's name, job title, company, location, LinkedIn profile and phone number. Upload a list of emails and get back a complete contact database.
How many data providers do you check?
25+, in a waterfall. Cleanlist AI asks them one at a time and stops at the first deliverable result. That pool returns 98% verified work emails and 85% phone numbers on the 500-lead benchmark.
Can I do bulk email verification and enrichment?
Yes. Drop in a CSV of 10,000+ emails and Cleanlist AI runs all three checks on every address at half a credit each, then enriches the good ones with phone, company, title and LinkedIn. A file that size usually finishes within minutes.
Does Cleanlist AI have an email verification API?
Yes. The Cleanlist AI API v2 runs email verification and waterfall enrichment with clapi_ Bearer keys and OAuth scopes. Every request returns a signed cost quote before a credit is spent, results come back by polling, and the API is on Pro and Enterprise.
Is there a free email verification tool I can try?
Yes. The free email checker tests one address at a time. For a whole list, the 14-day Pro trial has 250 credits, enough to verify 500 addresses at half a credit each. After the trial, the Free plan includes 50 credits a month, and paid plans start at $49 per seat a month.
What accuracy rate does your email verifier achieve?
98% verified work emails and 85% phone numbers on the 500-lead benchmark. Each status comes from the mail server's own answer, and the three checks catch invalid, risky and undeliverable addresses before you send, so fewer emails bounce and your sender reputation holds.
Upload the list. Keep the real ones.
Every address gets a status for half a credit, so the 14-day trial covers 500 of them. The good ones can come back as full contacts with name, title and phone number.
14 days of Pro, free.