Verify Email Addresses in Your HubSpot CRM
Automatically enrich, verify, and clean your CRM contacts with data from 25+ providers. Changes sync back to your CRM in real-time.
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Verify an email freeHow does Cleanlist verify email addresses in your HubSpot CRM?
Cleanlist verifies every email address in your HubSpot CRM before you send a single message. The native HubSpot integration scans your contact database and checks each email against multiple verification engines: SMTP validation, MX record checks, catch-all domain detection, disposable email filtering, and role-based address flagging. Results write back to a custom HubSpot property so you can build active lists that automatically exclude unverifiable emails, create workflows that quarantine new contacts with risky addresses, and clean your marketing contact list to avoid paying for undeliverable records.
Why this is hard to do by hand
HubSpot marketing contacts with invalid email addresses cost you money on two fronts: HubSpot's tiered pricing charges for every marketing contact regardless of whether their email works, and sending to invalid addresses damages your sender reputation, pushing future emails to spam. HubSpot flags hard bounces after the fact but provides no way to proactively verify emails before they enter your database or before you launch a campaign. By the time you see the bounce, the damage to your sender score is already done.
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
Catch-all (or accept-all) domains are configured to accept email sent to any address at that domain, whether the specific mailbox exists or not. This means you can send to john.smith@catch-all-domain.com and it will not bounce, even if John Smith left the company years ago. Most email verification tools report catch-all addresses as 'valid' because the SMTP check succeeds. In catch-all domains accept mail for any address at the domain, so a syntactically valid address on one can still have no mailbox behind it. That is why a catch-all needs a different verification path from an ordinary domain. That means 5% of the average B2B email list consists of addresses that pass basic verification but never reach a human. Cleanlist flags catch-all domains separately and applies secondary verification heuristics (LinkedIn profile matching, recent web presence, company directory cross-reference) to estimate real deliverability, reducing catch-all false positives by approximately 60%.
Source: Cleanlist verification analysis on 500,000 B2B emails, Q1 2026
Pay for the result, not the lookup
Cleanlist walks 25+ providers in cost order on a single lookup and charges once for what comes back. A verified work email is 1 credit, a direct dial is 10, both together are 11, validation is 0.5 and AI qualification is 5. A lookup that finds nothing costs nothing, and every seat draws on one shared team wallet.
- 98%Catch-all detection
- <5min10K emails verified
- 1-clickHubSpot OAuth
- 25+Providers queried in cost order on a single lookup
- 98%Verified work email on a 500-lead stratified benchmark
- 85%Direct dial on that same 500-lead test
- 0Credits to search. Free and unlimited on every plan
How It Works
- 01
Connect HubSpot to Cleanlist
Authorize via HubSpot OAuth in one click. Cleanlist creates a custom 'Email Verification Status' contact property in your HubSpot portal with values: Valid, Invalid, Catch-All, Disposable, and Role-Based.
- 02
Select Contacts to Verify
Verify your entire database, a specific HubSpot list, or contacts matching a filter (e.g., lifecycle stage = MQL, created in last 90 days, or lead source = purchased list). Prioritize credits on segments that matter most.
- 03
Run Multi-Layer Email Verification
Each email address is checked through multiple verification layers: syntax validation, DNS and MX record lookup, SMTP mailbox verification, catch-all domain detection, disposable address flagging, and role-based email identification.
- 04
Review Verification Results in HubSpot
Verification status writes directly to your HubSpot contact properties. See a summary dashboard with total valid, invalid, risky (catch-all), and disposable counts. Drill into any category to review individual contacts.
- 05
Build Smart Lists Based on Verification Status
Create HubSpot active lists that filter by email verification status. Use these lists to exclude invalid contacts from marketing emails, suppress catch-all addresses from cold outreach, and identify contacts needing alternative channels.
- 06
Enable Auto-Verification for New Contacts
Set up a HubSpot workflow that triggers Cleanlist verification when new contacts are created via form submissions, imports, or integrations. Bad emails are flagged before they enter your marketing database.
Key Benefits
Auto-Sync to Your CRM
Enriched data flows back to your CRM automatically — no manual exports or imports needed.
25+ data providers
Waterfall enrichment queries multiple sources so you get the highest match rate possible.
98% Email Accuracy
Real-time verification catches invalid, catch-all, and disposable emails before they enter your CRM.
14-Day Scale Trial
Every new workspace opens on Scale for 14 days: 250 credits, 3 seats, no credit card.
HubSpot Integration Setup
- Connect Cleanlist to your HubSpot portal via 1-click OAuth (no API keys to copy).
- Cleanlist 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: entire database, a specific HubSpot list, or contacts matching a filter (lifecycle stage = MQL, lead source = imported, etc.).
- Verification runs against multiple SMTP and catch-all detection engines; results write back to the custom HubSpot property in real time.
- Build a HubSpot active list filtered on Email Verification Status = Valid and route only deliverable contacts into marketing emails.
- Optional: turn on the new-contact workflow trigger so any new HubSpot contact is verified the moment it enters your portal.
Manual Process vs Cleanlist
| Feature | Manual | Cleanlist |
|---|---|---|
| When verification happens | After sending (bounce detection) | Before sending (proactive verification) |
| Catch-all domain handling | Marked as 'valid' (false positive) | Flagged separately with risk scoring |
| Disposable email detection | Not detected | 500+ disposable providers identified |
| Results stored in HubSpot | Only bounce/unsubscribe status | Custom property with 5 verification states |
| Impact on sender reputation | Damage occurs before detection | Prevention, bad emails never receive sends |
| Verification speed | N/A, reactive only | 10,000 emails verified in under 5 minutes |
Frequently Asked Questions
How accurate is Cleanlist's data?
Cleanlist achieves 98% email accuracy through real-time verification and cross-referencing across 25+ data providers. Every record is validated before delivery.
What do I get when I sign up?
Every new workspace opens on Scale for 14 days: 250 credits, 3 seats, no credit card, and every feature except the public API and MCP. After the trial the Free plan is $0 for 30 credits a month. Each credit processes one record (enrichment, verification, or lookup).
What data providers does Cleanlist use?
Cleanlist uses waterfall enrichment across 25+ providers including major B2B data sources. The system automatically selects the best provider for each record to maximize match rates.
Can I connect my CRM?
Yes. Cleanlist integrates with HubSpot, Salesforce, and other CRMs. Enriched data syncs back automatically. You can also upload CSV files or use the REST API.
Does the CRM integration work in real-time?
Yes. Once connected, Cleanlist can enrich new records as they enter your CRM or run batch enrichment on your existing database. Changes sync back automatically.
Does Cleanlist detect catch-all email addresses in HubSpot?
Yes. Catch-all domains accept all emails at the server level but may silently discard messages to invalid mailboxes, making them look 'valid' to basic verification tools. Cleanlist identifies catch-all domains and flags them separately so you can decide whether to include them in campaigns (typically recommended for cold email) or exclude them from marketing sends (recommended for nurture sequences where bounce rates matter more).
Can I downgrade my HubSpot plan after removing invalid marketing contacts?
Potentially, yes. After verification, you can set invalid and disposable contacts to 'non-marketing' status in HubSpot, removing them from your marketing contact count. If this drops you into a lower tier, you can contact HubSpot to downgrade. Cleanlist customers with 50,000+ contacts typically remove 5-12% of their marketing contacts after verification, with some qualifying for a lower HubSpot tier.
How often should I re-verify emails in my HubSpot database?
We recommend quarterly re-verification for your full database, plus real-time verification for every new contact at point of entry. Email addresses decay at approximately 2% per month in B2B databases, so quarterly verification catches most decay before it impacts your campaigns. High-volume senders (10,000+ emails per month) should consider monthly re-verification.
Gain full access for 14 days.
Upload a CSV or connect HubSpot, Salesforce or Pipedrive. Searching costs nothing, and a lookup that finds nothing costs nothing.
No card to start. Every new organization gets fourteen days on Scale with 250 credits and three seats, every feature except the public API and MCP. The Free plan stays at 30 credits a month after that.
Gain full access for 14 days.
250 credits, 3 seats, no card needed. Access to every feature except public API & MCP.