Verify Your Email List in Seconds
Verify Your Email List: upload a CSV or connect your CRM, and Cleanlist AI checks each row against 25+ providers in sequence. Every new workspace opens on Pro for 14 days with 250 credits, 3 seats.
Cleanlist AI validating email-list.csv. Each address is marked Verified, Likely valid, Risky, Invalid or Unknown. Of 10,000 rows, 8,612 Verified, 604 Likely valid, 431 Risky, 287 Invalid, 66 Unknown.
10,000+ users, from founders to full sales teams
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How does Cleanlist AI verify your email list in seconds?
Cleanlist AI runs every address through a multi-layer verification pipeline: SMTP handshake, MX record validation, catch-all domain detection, disposable email filtering, and role-based address flagging. Each address goes past more than one verification engine in sequence. That is how a catch-all domain (12-18% of B2B domains in our Q1 2026 data) gets flagged as catch-all, where a single SMTP check would pass it as valid.
Why this is hard to do by hand
Every address that bounces counts against your sending domain. Mailbox providers track your bounce rate as you send, and a high one gets the whole domain throttled or blocklisted. Most teams find out after the campaign has gone out, when inbox placement for the rest of the list has already dropped.
Catch-all domains are the blind spot in B2B email verification
12-18%of B2B domains are configured as catch-all
A catch-all mail server accepts every address at the SMTP level, whether the mailbox exists or not. Most verification tools see that 'accepted' and mark the address valid. Many of those domains then drop mail sent to mailboxes that don't exist, and the bounces pile up against your sender reputation. Cleanlist AI verified 4.2 million B2B addresses in Q1 2026: 12-18% of corporate domains were catch-all, and about 35% of the tested addresses on them were undeliverable. Cleanlist AI compares the answers from several verification engines with past delivery patterns to flag the catch-all addresses likely to bounce.
Source: Cleanlist AI verification pipeline data, Q1 2026 (4.2M addresses processed)
What a lookup costs
Each lookup walks 25+ providers in cost order, and you're charged once for what comes back: 1 credit for a verified work email, 10 for a phone number, 11 for both. Validation is 0.5 and AI qualification is 5. A lookup that finds nothing is free, and the whole team pays from one wallet.
- Verified work emails25 leads searched23 × 123
- Phone numbersVerified before anyone calls18 × 10180
- Qualification agentFit score with reasons25 × 5125
- 25+Providers queried in cost order on a single lookup
- 98%Verified work emails on our 500-lead benchmark
- 85%Phone numbers found on that same benchmark
- 0Credits for a lookup that finds nothing
How it works.
- 01
Upload your email list
Drop in a CSV or paste the emails. Cleanlist AI finds the email column and cleans up extra spaces, mixed case and trailing characters on its own.
- 02
Syntax and domain pre-check
Obvious invalids (typos like gmial.com, missing @ signs, localhost domains) get flagged before any credit is spent. An MX lookup confirms the domain can receive mail.
- 03
Multi-provider SMTP verification
Each remaining address runs through SMTP verification engines in sequence. When the first engine returns an ambiguous answer, the next one confirms or rejects it, which cuts false positives.
- 04
Catch-all and disposable detection
Catch-all domains accept any address at the server and often drop mail to mailboxes that don't exist. Cleanlist AI flags them with a risk score. Addresses from disposable services like Guerrilla Mail and Mailinator go into their own group.
- 05
Risk scoring
Every address gets a verdict: Safe, Risky or Invalid. Role addresses (info@, sales@, support@) carry their own tag, so you decide whether they go in the campaign.
- 06
Download the verified list
Export a CSV with verification status columns added, or push the safe addresses to your ESP. Your original columns stay as they were.
What you get.
98% verified work emails
That's on our 500-lead benchmark. Cleanlist AI checks each email and flags catch-all and disposable addresses before you send.
25+ data providers
Cleanlist AI asks them one at a time and stops at the first deliverable result. When one provider has nothing, the next one gets its turn.
No code required
Upload a CSV or connect your CRM. If your engineers want it, the API is there from the Pro plan.
14-day Pro trial
250 credits and 3 seats on Pro for 14 days. You don't need a card or a sales call to start.
Manual process vs Cleanlist AI.
| Feature | Manual | Cleanlist AI |
|---|---|---|
| Catch-all domain handling | No detection, marked as valid | Flagged as catch-all, with a risk score |
| Cost of verifying 10K emails | A free tool, and hours of batching around its limits | 5,000 credits, at 0.5 per address |
| Ambiguous SMTP results | Taken at face value from one check | Re-checked by the next engine in the waterfall |
| Disposable email detection | Not included in most free tools | Disposable addresses flagged and grouped separately |
| Role-based address flagging | Manual regex filtering | Tagged automatically, you choose send or skip |
| ESP reputation protection | You find out after the bounce spike | Risky addresses removed before you hit send |
How accurate is Cleanlist AI's data?
Cleanlist AI returned 98% verified work emails and 85% phone numbers on our 500-lead benchmark, pulling from 25+ data providers. Each lookup stops at the first deliverable result, meaning a verified or likely-valid email.
What do I get when I sign up?
A 14-day Pro trial: 250 credits, 3 seats, and every Pro feature. After it, the Free plan gives you 50 credits a month. A verified work email costs 1 credit, a phone number 10, and a miss nothing.
What data providers does Cleanlist AI use?
Cleanlist AI runs a waterfall across 25+ B2B data providers. For each record it asks one, moves to the next when that one has no match, and stops at the first deliverable result.
Can I connect my CRM?
Yes. HubSpot and Salesforce sync both ways on the Pro and Enterprise plans, and Salesloft and Lemlist take a one-way push. You can also upload a CSV, or use the REST API from Pro.
How long does it take to verify my data?
It depends on the size of the file and how far down the waterfall each row has to go. Cleanlist AI runs the whole CSV as one job, so you upload once and download or sync the results when it's done.
What happens to catch-all emails during verification?
Cleanlist AI puts them in their own group with a risk score. A catch-all server accepts every address, so an SMTP check alone can't tell a real mailbox from a dead one. You choose whether to send to the low-risk ones or drop them all.
How often should I re-verify my email list?
Before every big campaign, and at least monthly for a list you mail often. People change jobs and companies retire domains, so a list that verified clean last quarter won't be clean now. On Pro and up, you can run the checks on a schedule through the API.
Does verification work on free email providers like Gmail and Outlook?
Yes. Cleanlist AI verifies addresses at Gmail, Outlook, Yahoo and iCloud as well as company domains. Some of those providers rate-limit SMTP checks, so when one engine gets throttled, the waterfall passes the address to the next.
Describe the job once. An agent runs it every week.
Clu turns one sentence into an agent. It searches 1B+ profiles, finds verified emails and phone numbers across 25+ providers, adds the people to your sequence and posts each run to Slack.
Weekly ICP outbound
Built by Clu from: “Every week, find 500 new people who match my ICP, get their emails and phones, and add them to Series B outbound.”
- Searched 1B+ profiles for new ICP matches500 foundPeople Search
- Ran the waterfall across 25+ providers487 emails · 412 phonesWaterfall
- Verified every email and phoneSMTP + catch-allVerification
- Added them to Series B outbound500 peopleSequences
- Posted the run to #pipelineSlackAgents
Friday 4:52 PM15 replies · 5 calls booked
Everything in the 14-day Pro trial
- Clu and agentsDescribe the job in one sentence. Clu builds the agent, runs it on a schedule or a CRM trigger and posts every run to Slack.
- People and Company SearchFind your buyers in 1B+ profiles from one sentence. Searching costs 0 credits.
- Waterfall enrichmentAsk 25+ providers in order and stop at the first verified email or phone number. 98% verified work emails and 85% phone numbers on a 500-lead benchmark.
- Email verificationRun SMTP and catch-all checks on every address before it reaches a sequence, at half a credit an email.
- ICP scoringScore every lead 0 to 100 against your ICP, with the reasons written down. The Research and Qualification skills do the digging.
- SequencesSend email from your reps' own inboxes, with call tasks. A reply stops the sequence. Sending costs 0 credits.
- CRM syncTwo-way sync with HubSpot, Salesforce and Pipedrive. Push finished lists to Outreach, Salesloft and Lemlist.
- Chrome extensionGet a verified email and phone number in one click on LinkedIn, Sales Navigator, Salesforce and HubSpot.
- MCP and APIRun the same search and waterfall from Claude or ChatGPT with 36 MCP tools, or from your own code with the REST API.
14 days of Pro, free: 250 credits, 3 seats, agents, Sequences and Clu in Slack. Then Free at 50 credits a month, or Starter at $49 and Pro at $89 a seat a month.
Hand the job to an agent.
Upload a CSV or connect HubSpot, Salesforce or Pipedrive, and run it on your own data today.
14 days of Pro, free.
Get 14 days of Pro, free.
250 credits and 3 seats. Sign up with your work email for 100 more.