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Free email pattern detector: any company's format in one query

Paste a company domain. Get the email format their employees use (first.last@, flast@, first@, etc.) with a confidence score and sample addresses. 15 free queries per day, no signup.

Try it

domain Paste a domain like stripe.com to detect the email pattern.

How pattern detection works

Companies pick one email format and stick with it. The detector pulls publicly listed addresses for the domain (press releases, GitHub commits, conference speaker pages, SEC filings, LinkedIn signatures), groups them by structure, and surfaces the most common pattern with a confidence percentage.

For a 100-person company with five public addresses all in first.last@ form, confidence will be high. For a 5-employee startup with no public footprint, confidence may be low and you should verify any guess via the SMTP verifier before sending.

Common email patterns

first.last@

jane.smith@stripe.com. The default at most modern tech companies and enterprises. Roughly 60% of B2B domains use this.

first@

jane@stripe.com. Common at small companies and early-stage startups. Breaks once two employees share a first name.

flast@

jsmith@stripe.com. Standard at older enterprises (Microsoft, IBM) and most US financial firms.

first.l@

jane.s@stripe.com. Less common but appears at some European companies and design-led teams.

Pattern detection vs guessing

Guessing

Try first.last, get bounce. Try flast, get bounce. Try first, get inbox. Three sends, two bounces, sender score drops.

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Pattern detection

Detect the format once, apply it to every contact at that company. Zero bounces, sender score intact.

Pricing

Free

100 verified lookups per day, forever. No card.

Monthly

$9.99/mo

300,000 credits per cycle.

Lifetime

$249 once

2,000,000 credits, lifetime pool.

Frequently asked questions

How accurate is the pattern detection? expand_more

For companies with public footprint (50+ employees, mentions in press, conference talks, GitHub activity), confidence is typically 80–95%. For very small companies with little public presence, the detector may return low confidence or no data, in which case the SMTP verifier is the better next step.

Can a company use more than one pattern? expand_more

Yes. Large companies sometimes have legacy users on an older pattern (flast) and new hires on the current pattern (first.last). The detector flags multi-pattern domains in its confidence score and surfaces both options. Always verify a specific guess via SMTP before sending.

What if the company uses a catch-all? expand_more

Catch-all domains accept every address, so SMTP cannot confirm whether a specific guess is a real mailbox. Pattern detection still works because it relies on observed public addresses, not SMTP. Pair it with the catch-all flag from the verifier to decide whether to send.

Does the detector store the domains I check? expand_more

No. Each request goes through a proxy that records only your IP for rate limiting, not the domain itself. The detection call is stateless on this widget.

Can I detect patterns in bulk? expand_more

Yes, via the Mailsfinder API. Upload a list of domains, get patterns + sample addresses back as a CSV. The Monthly plan ($9.99) covers 300,000 credits per cycle, enough for tens of thousands of domain lookups.

Detect, apply, verify, send

Mailsfinder does all three in one API call. 100 free credits per day, no card.

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