Verify Email Addresses in Your HubSpot CRM
Cleanlist AI fills the missing emails and phone numbers on your CRM contacts from 25+ providers and verifies the ones already there. A lookup that finds nothing costs nothing.
A HubSpot contact record for Marcus Vale, VP of Sales at Omni, enriched by Cleanlist in place: Job title updated, Work email kept, Phone filled, Seniority filled, Department filled, Owner kept. Nothing the rep entered is overwritten.
Omni10,000+ users, from founders to full sales teams
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How does Cleanlist AI verify email addresses in your HubSpot CRM?
Cleanlist AI verifies every email address in your HubSpot CRM before you send a single message. The HubSpot integration runs each address through SMTP validation, MX record checks, catch-all detection, disposable filtering and role-based flagging, and the result lands in a custom contact property. Active lists built on that property keep bad addresses out of every send. A workflow can quarantine new contacts with risky addresses, and the undeliverable ones can come off your marketing contact count.
Why this is hard to do by hand
Invalid addresses cost you twice in HubSpot. You pay for every marketing contact in your tier whether the email works or not, and each send to a dead address pushes your sender reputation toward the spam folder. HubSpot logs a hard bounce after it happens. It has no way to check an address before it enters the database or before a campaign goes out.
Catch-all domains account for 14% of B2B emails, and most tools mark them as valid
14%of B2B email addresses are on catch-all domains
A catch-all (or accept-all) domain takes email for any address at that domain, whether the mailbox exists or not. Send to john.smith@catch-all-domain.com and it won't bounce, even if John Smith left the company years ago. Most verification tools report these addresses as valid because the SMTP check succeeds. A well-formed address on a catch-all can still have nobody behind it, so catch-alls need a different verification path from ordinary domains. Cleanlist AI flags catch-all domains as their own status, so you decide whether they go into a send.
Source: Cleanlist AI verification analysis on 500,000 B2B emails, Q1 2026
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
Connect HubSpot to Cleanlist AI
Authorize with HubSpot OAuth in one click. Cleanlist AI adds an 'Email Verification Status' contact property with five values: Valid, Invalid, Catch-All, Disposable and Role-Based.
- 02
Pick the contacts to verify
Run the whole database, one list, or a filter such as lifecycle stage = MQL, created in the last 90 days, or lead source = purchased list. Start with the segments you're about to email.
- 03
Run the checks
Each address goes through syntax validation, a DNS and MX lookup, an SMTP mailbox check, catch-all detection, disposable flagging and role-based detection.
- 04
Read the results in HubSpot
The status is written to each contact. A summary shows how many came back valid, invalid, catch-all and disposable, and you can open any group to see the contacts in it.
- 05
Build lists on the status
Filter active lists by verification status. Keep invalid contacts out of marketing email, hold catch-alls back from cold outreach, and find the contacts you'll need to reach another way.
- 06
Verify new contacts on arrival
A HubSpot workflow can call Cleanlist AI whenever a contact is created by a form, an import or an integration. Bad addresses get flagged before they reach your marketing lists.
What you get.
Writes back to your CRM
Two-way sync with HubSpot and Salesforce (Pro and Enterprise plans) puts enriched fields straight onto the contact record.
25+ data providers
The waterfall asks them in sequence and stops at the first deliverable result, so a contact one provider misses can still come back from the next.
98% verified work emails
Measured on our 500-lead benchmark. Cleanlist AI flags invalid, catch-all and disposable addresses before they reach your CRM.
14-day Pro trial
250 credits and 3 seats on the Pro plan for 14 days.
HubSpot integration setup.
- Connect Cleanlist AI to your HubSpot portal via 1-click OAuth (no API keys to copy).
- Cleanlist AI creates a custom Email Verification Status property on the Contact object with five values (Valid, Invalid, Catch-All, Disposable, Role-Based).
- Choose the contacts to verify: the whole database, one HubSpot list, or contacts matching a filter (lifecycle stage = MQL, lead source = imported, etc.).
- Cleanlist AI checks each address with several SMTP and catch-all detection engines and writes each result back to that property as soon as it's ready.
- Build a HubSpot active list filtered on Email Verification Status = Valid and send marketing email only to that list.
- Optional: turn on the new-contact workflow trigger, and every new HubSpot contact is verified as it enters the portal.
Manual process vs Cleanlist AI.
| Feature | Manual | Cleanlist AI |
|---|---|---|
| When verification happens | After sending (bounce detection) | Before sending |
| Catch-all domain handling | Marked as 'valid' (false positive) | Flagged separately with risk scoring |
| Disposable email detection | Not detected | Disposable domains flagged |
| Results stored in HubSpot | Only bounce/unsubscribe status | Custom property with 5 verification states |
| Impact on sender reputation | Damage happens before you see it | Bad addresses are left out of the send |
| Cost per address | Paid in bounces and sender reputation | 0.5 credits per email validated |
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.
Does the CRM integration work in real-time?
The HubSpot and Salesforce sync runs both ways, so enriched fields write back to the same records. You can run the contacts already in your CRM as one batch, then enrich new ones as they come in.
Does Cleanlist AI detect catch-all email addresses in HubSpot?
Yes. A catch-all domain accepts mail for any address, so basic checkers call it valid even when the mailbox is gone. Cleanlist AI gives catch-alls their own status. Include them in cold email if you like, and leave them out of nurture sends, where bounces hurt more.
Can I downgrade my HubSpot plan after removing invalid marketing contacts?
Possibly. Set invalid and disposable contacts to non-marketing after verification and they stop counting toward your tier. If that puts you under a lower tier's limit, HubSpot can move you down.
How often should I re-verify emails in my HubSpot database?
Re-verify the full database every quarter, and verify each new contact as it arrives. If you send more than 10,000 emails a month, go monthly.
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.