Email format checker
Type a company domain. We show the email patterns we see for that company and their share, whether the domain is catch-all, and which mail provider it runs on. Free and unlimited, because it reads aggregates and never shows a person.
Try:
Most "email format checker" tools check whether a string looks like an address. That's syntax, and it isn't what anyone searching the phrase wants. This one answers the real question: what pattern does this company actually use? The shares come from the work emails we hold for people at that domain, recounted weekly, with the sample size shown so you can judge it.
The eight patterns that cover most companies
Share of companies on file whose dominant pattern is each of these. Counted 2026-10-20.
| Pattern | Example | Share of companies |
|---|---|---|
| first.last | priya.raman@ | 46% |
| first | priya@ | 17% |
| flast | praman@ | 14% |
| firstlast | priyaraman@ | 8% |
| f.last | p.raman@ | 6% |
| last.first | raman.priya@ | 3% |
| first_last | priya_raman@ | 3% |
| Other | 3% |
How to use it
- 01
Type a domain
northwind-traders.example, or paste the website URL; we strip it to the domain.
- 02
Read the patterns and the catch-all flag
A dominant pattern over 70% is safe to use. Catch-all means the server accepts everything, so a checker can't confirm a mailbox.
- 03
Find the person
The email finder picks the right pattern, checks the mailbox and returns the address with a state. 1 credit if found.
Know the pattern, need the person?
The finder uses this same pattern data, then checks the mailbox. Three free lookups a day.
Email format questions
Where do the shares come from?
From the work emails we hold for people at that company, counted weekly. The sample size is shown; under 20 addresses the share is a hint, not a fact.
What does catch-all mean?
The mail server accepts every address, valid or not, so a pattern can't be confirmed by checking. About a third of B2B domains are catch-all. We say so, and the finder labels those addresses risky.
Why is this unlimited when the finder isn't?
It shows aggregates about a company, never a value about a person. There's nothing to scrape and nothing to protect.
Can I get this for a list of domains?
Yes, through GET /v1/company/{domain} in the API, free with any person match or 1 credit standalone. A bulk version of this tool is on the list.
Is this just a syntax checker?
No. Syntax checkers tell you whether a string has an @ in it. This tells you which pattern a company uses and how confident you can be.