Find Email Addresses by Company Domain
Paid: pay as you go or pick a plan. Enter a company domain to find the people receiving mail there with no names needed. Try with
- No email sent
- Pay as you go
Over 1 million email checks run on StartupHub.ai
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Every check looks at syntax, MX records, disposable provider, role-based address and catch-all domain and resolves into a 0 to 100 confidence score. No email is ever sent to the address being checked.
[email protected] is deliverable
Deliverable
- Syntax
- Valid
- MX records
- Found
- Disposable
- No
- Role-based
- No
- Catch-all
- No
- Confidence
- 95 / 100
Why you need to verify email addresses
Better deliverability
Addresses marked Not deliverable are flagged before you send so they never bounce.
Lower sending costs
You only spend sends, credits and follow-up time on addresses marked Deliverable.
Stay off blocklists
Disposable providers are flagged before you send and sending to many of them hurts a sender reputation.
How the StartupHub.ai verifier works
- Step 1
Add your email address
Paste one address in the box or paste up to 100 in bulk, one per line.
- Step 2
The address is checked
Every check looks at syntax, MX records, disposable provider, role-based address and catch-all domain and resolves into a 0 to 100 confidence score. No email is ever sent to the address being checked.
- Step 3
Read the result
Each result shows Deliverable, Not deliverable, or Can't verify. Catch-all domains return Can't verify rather than falsely marked deliverable and include a 0 to 100 confidence score.
What people use find emails by domain for
You have a stealth company domain with no team page. Enter the domain, pick Israel, United States or Canada, and watch it test common first names against it from scanning the domain and activating Lighthouse engine to match confirmed and return every mailbox that answers.
You only have a company domain and no contact name yet. Enter the domain to get the people receiving mail there, each with a verified work address when one can be found.
You want to reach the right person at a small company before you spend a send. Start from the domain and pick by role, such as Founder or CEO, from the people it returns.
You want to do this from code or an agent. List the company’s team with list_startup_team over the StartupHub.ai MCP server then run discover_email to find a work address from a name and company domain or validate_email to check if it is deliverable.
You have a stealth company domain with no team page. Enter the domain, pick Israel, United States or Canada, and watch it test common first names against it from scanning the domain and activating Lighthouse engine to match confirmed and return every mailbox that answers.
- Scanning domain
- Google Workspace mail, "coming soon" homepage
- Lighthouse engine
- Registered 24 Aug 2026, Tel Aviv
- Agents
- Israeli first names, one per mailbox
- Found match
- y•••@glusecurity.com
- Corroborating
- GLU AI SECURITY LTD, company 517396453
- Deep intelligence
- Status page live, Anthropic and Apple verified
- Match confirmed
- Verified mailbox, high confidence
Sweep a domain by country
Israel, United States or Canada · Every working mailbox, not one guess · Address masked here
Keep using it
Free
0 finds a day
On this page, no card.
Email verification wherever you work
Verify from an AI agent over MCP, a pasted list, the API, and Google Sheets.
MCP and AI agents
Connect StartupHub.ai over MCP or the API so your agent checks an address before it sends. It works in Claude, ChatGPT, Cursor and n8n.
> Add the MCP server https://www.startuphub.ai/api/v1/mcp (name: StartupHub.ai) and use its validate_email and discover_email tools to verify and find work emails before I send.
> Check [email protected] is deliverable before I send
● startuphub - validate_email (MCP)
⎿ status: deliverable, confidence: 95
● [email protected] is deliverable. Safe to send.
Claude Code
Connect StartupHub.ai's MCP server once and Claude Code can check an address mid-task. The validate_email tool returns the verdict and the 0 to 100 confidence score.
Set up in Claude Code3 email addresses verified
- [email protected]Deliverable
- [email protected]Not deliverable
- [email protected]Disposable
Bulk email verifier
Paste up to 100 addresses at once, one per line, and export as CSV.
Bulk email verifier{
"email": "[email protected]",
"valid": true,
"status": "deliverable",
"confidence_score": 95
}Email verification API
Add verification to your product with the REST API. Past the free allowance, pay as you go is $0.005 per check.
Email verification API| Email address | Status | Score | |
|---|---|---|---|
| 1 | [email protected] | Deliverable | 95 |
| 2 | [email protected] | Not deliverable | 0 |
| 3 | [email protected] | Disposable | 10 |
Google Sheets
Google Sheets connects through Zapier or Make to send each row to the API and write the verdict back.
Set up in SheetsSince January 2025, StartupHub.ai has run over 1 million email checks for sales, recruiting and research teams
Email checks run
+1M
Email checks, running total
Last 30 days
+101,000
Successful validations
+33,000
Emails discovered
Private by design
No email is ever sent to the address being checked and validation history is stored in your own account only. We never sell data and never share individual validations with third parties.
Read our privacy policy- No email sent to check
- Never sold or shared
- History stays in your account
Find more data on the companies you care about
StartupHub.ai profiles AI startups, investors and people with funding, team and tech stack data on the site, over the REST API and over MCP.
- No email sent to check
- REST API and MCP
- Pay as you go
Platform
Find leads on StartupHub.ai
Search startups, investors and people then find and verify their work emails. Start free with no account needed.
Search the directoryData
Use our data API
Put startup, investor, people and email data inside your product over a REST API and pay as you go per call.
Read the API docsAI
Add StartupHub.ai to AI
Give AI assistants and agents our data over MCP. The MCP connection works in Claude, ChatGPT, Cursor and n8n.
Connect StartupHub.ai to AIFind Email Addresses by Company Domain, explained
Use this tool to find email addresses by domain when you only have a company website. Enter a company domain with no name and the domain finder returns the people receiving mail there with verified addresses and the company's email address pattern, so you can reach a team instead of guessing one contact.
Every address runs on the same verification engine and is labelled Deliverable, Not deliverable, or Can't verify. Anonymous visitors get 5 finds per day with no account and a single check returns in under 500 ms. The same engine is available as a REST API and an MCP server on every tier for running the search across a list of domains.
How it works
- Enter the company domain you want to search.
- Identify the email address pattern and the people receiving mail there.
- Review each address with its Deliverable, Not deliverable, or Can't verify label.
Questions about the find email addresses by company domain
If you do not find the answer here, reach us from the help and contact page.
Help and contactHow do I find email addresses for a company domain?
Enter the company domain and the domain finder returns the company's email address pattern and the people receiving mail there with verified addresses. Anonymous visitors get 5 finds per day with no account.
Do I need a name to find an email by domain?
No, the domain alone is enough and the domain finder scans a company domain for the people receiving mail there and returns the company's email address pattern and verified addresses. If you know the first and last name the email finder by name returns one person's address from a first name, last name and domain.
What does Can't verify mean on a domain result?
It means the domain is catch-all and accepts mail for any address. No single address can be proven from outside, so the result is labelled Can't verify rather than marked deliverable.
Can I run this across many domains?
Yes, you can run the search across many domains through the REST API and the MCP server. The same engine is available on every tier including the free one, with 5 finds per day with no account.
How does email validation work here?
By checking what is observable from outside: whether the address parses, whether the domain publishes mail servers, whether the provider is a disposable one, whether the local part is a role address, and whether the domain accepts everything sent to it. No message is ever sent to the address, which is why the result is a confidence score rather than a guarantee.
Is it free, and is there a limit?
It is paid on pay as you go at $0.005 per validation and $0.015 per find, or on a plan for volume.
