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.
Add verification to your workflow
Check prospects before a sequence
Sales teams can run a prospect list through the email validator before it enters a sequence and prioritize addresses marked Deliverable.
Keep bounces off your domain
Sales teams can filter addresses marked Not deliverable so bounces do not hurt the domain they send from.
Trust the CRM record
Sales teams can re-check CRM contacts with the email validator so reps work from addresses that still receive mail.
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 AICommon questions about the email validator.
If you do not find the answer here, reach us from the help and contact page.
Help and contactHow 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?
Free, and no account is needed. It is metered rather than unlimited: 5 validations and 5 finds a day. Signing in does not reduce that, and paid plans raise it.
Can I validate a list at once?
Yes, up to 100 addresses in one batch, one per line, returned as a table you can export. Larger jobs are what the REST endpoint is for.
Can I find an email from a name and a company?
Yes. Give a first name, a last name and a domain, and the common address patterns are generated and then verified, so what comes back has been checked rather than guessed.
What is a catch-all domain?
A domain configured to accept mail sent to any address at it, existing or not. That means an outside check cannot confirm one specific mailbox, so the result is reported as catch-all rather than valid. It is information, not a failure: mail will very likely be accepted, but you cannot prove the mailbox exists.
Is there an API?
Yes, and it needs no key: POST an address to /api/v1/email/validate, or a name and domain to /api/v1/email/discover. CORS is open so it works from a browser. There is also an MCP server, so an assistant can call it directly.
Can I find an email from a LinkedIn URL?
Yes. Switch the tool to LinkedIn, or use the LinkedIn email finder page: paste any profile URL and get the verified business email.
Is my data stored?
Validation history is stored in your account only. We never sell data and we don't share individual email validations with third parties.
