Format
The address is written correctly, with one @ and a real-looking domain.
Email verification
Check every email before you send.
Email Chekkr checks the format, the domain, the mail server, temporary inboxes, team addresses and typos. One address or a whole list, in seconds.
Free for single checks. No sign-up.
Try:
Only the part after the @ is looked up. The address stays in your browser.
Have a list? Check a CSV →
What we check
Six checks on every address
Each one catches a different reason emails bounce or land badly.
Domain
The domain exists. Made-up and expired domains are caught here.
Mail server
The domain has a mail server that accepts email.
Temporary inboxes
Flags throwaway addresses from 10,000+ known disposable services.
Team addresses
Spots shared inboxes like info@ or sales@ that rarely reach one person.
Typos
Catches slips like gmial.com or company.con and suggests the fix.
How it works
From a messy list to one you can send to
Add your emails
Type one address, or drop a CSV exported from your CRM or spreadsheet.
Email Chekkr checks each one
Six checks run in your browser. Only domains are looked up, never full addresses.
Download a clean list
Get your file back with a result, score and reason for every row, or only the valid ones.
Results
What each result means
Every address gets one of four results and a score from 0 to 100.
Valid
Written correctly, and the domain has a working mail server. No warning signs. Safe to send.
Risky
The domain takes email, but something is off: a temporary inbox, a team address like info@, a likely typo, or no mail server record.
Invalid
Badly written, or the domain doesn't exist or doesn't accept email. Sending will bounce.
Unknown
The domain didn't answer in time. Check it again later before removing it.
Private by design
Your list stays with you
- Checks run in your browser. Your CSV is never uploaded.
- Only the domain is looked up, for example example.com, never the full address.
- No cookies, no analytics, no ad trackers.
Good to know
What it doesn't do
- It doesn't log in to mail servers, so "valid" means the address and domain look deliverable, not that this exact mailbox was confirmed.
- It never sends an email to anyone on your list.
- It doesn't store your addresses anywhere.
FAQ
Questions
Is my list uploaded anywhere?
No. Your CSV is read and checked inside your browser. To see if a domain receives email, Email Chekkr asks a public DNS service about the domain only (for example example.com), never the full address.
Why is an address "risky" and not "valid"?
Its domain takes email, but there's a warning sign: a temporary inbox, a team address, a likely typo, or no mail server record. You decide whether to keep it.
How many addresses can I check?
Single checks are unlimited. A CSV can have up to 10,000 rows; bigger lists can be split into several files.
Does it cost anything?
Single checks are free. Bulk checks are free during early access, and paid plans from $5 are coming. See Pricing.
Can I use it from my own app or an AI tool?
Yes. There's a REST API and an MCP server for Claude, Cursor and other AI tools. See the API docs.
Clean your list before your next send.
Single checks are free. Bulk plans from $5 are coming soon.