Email Format Finder
domainranked address patterns
Example of what the finder returns for linear.app: a ranked list of likely email formats, each with an example address.
Use this free email format finder to discover the most common email patterns at any company. Enter a domain to see formats like first.last@, flast@, firstl@, and 30+ other variations, ranked by likelihood.
Find the real address, verified
The finder shows the likely pattern. Cleanlist AI looks up the address itself and verifies it before it reaches your list, at 1 credit per verified email.
The Free plan is $0 with 50 credits a month and 5 searches. Every new workspace can also try Pro free for 14 days.
- Search
- Free
- Verified work email
- 1 credit
- Phone number
- 10 credits
98% verified work emails and 85% phone numbers on our 500-lead benchmark, across 25+ providers.
A demo of Clu, the Cleanlist AI agent, doing this for a whole list. Asked: Find the verified work email for everyone in Series B sales leaders Clu runs the tools, asks for confirmation before spending credits (Find work emails for 212 leads on Series B sales leaders, 212 credits), fills the list row by row and reports: 197 verified emails on the list, 15 not found. Want phone numbers for the 197 next?
10,000+ users, from founders to full sales teams
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The Cleanlist AI Chrome extension finds the verified email and phone number for the LinkedIn profile you have open, in the same tab.
Find a company's email format
To find someone's email format, enter the company domain and the tool returns the patterns that organization uses (first.last@, flast@, and 30+ more), ranked by likelihood. It identifies the primary format correctly 87% of the time on the first guess. Verify the constructed address before sending, since format prediction is not deliverability.
The toolEmail Format FinderRunsRuns in your browserFree quotaUnlimitedTakesdomainReturnsranked address patterns
How does this tool work?
Every company follows a pattern for employee email addresses, and knowing that pattern is half the battle in B2B outreach. This email format finder analyzes a company domain and returns the most likely email conventions, ranked by how frequently each pattern appears across public sources and provider data.
Format prediction is probabilistic: the most common convention is usually right, but a prediction is never proof an address exists. The tool checks 34 distinct format variations (including hyphenated names, middle initials, and department-based patterns like sales@) that most competitors miss entirely.
Once you know the pattern, you can construct likely addresses for anyone at the company. For example: a search for google.com returns first.lastname@ as the top match, followed by flastname@ and lastname.first@. A search for a smaller company often surfaces less standard patterns (firstname@ or first_last@) that you would have spent 20 minutes guessing on LinkedIn.
That guesswork costs time and risks sender reputation, every email you send to a malformed or non-existent address counts as a bounce. The format finder gives you the pattern in under a second, and once you have the pattern, the free email verifier confirms whether the specific constructed address is deliverable before you press send.
Together the two free tools replace the slow loop of: open LinkedIn → guess format → send email → wait two days → see the bounce. That said, format prediction is a probability not a guarantee, for verified individual addresses at scale, Cleanlist AI's waterfall enrichment cross-checks across 25+ providers per lookup and returns triple-verified emails with 98% accuracy.
Who uses the Email Format Finder?
The people who run it most, and what each one runs it for.
- Sales teamsCatch a dead address before a rep spends time writing to it.
- MarketersClean a list before the campaign goes out, so bounces don't hit the sending domain.
- RecruitersConfirm a candidate's contact details are real before you reach out.
- FoundersCheck an address before you email an investor, partner or buyer.
- RevOpsKeep CRM records accurate so routing, scoring and reports hold up.
- AgenciesCheck client data before it goes into a live campaign.
What does Cleanlist AI do with a whole list?
This free tool checks one record at a time. Watch a real search go from query to an enriched, validated, CRM-ready list: 36 leads, 100% contact fill, synced to HubSpot.
36 ICP leads, 100% contact fill, validated and pushed to HubSpot in one flow
Describe the job once. An agent runs it every week.
Clu turns one sentence into an agent. It searches 1B+ profiles, finds verified emails and phone numbers across 25+ providers, adds the people to your sequence and posts each run to Slack.
Weekly ICP outbound
Built by Clu from: “Every week, find 500 new people who match my ICP, get their emails and phones, and add them to Series B outbound.”
- Searched 1B+ profiles for new ICP matches500 foundPeople Search
- Ran the waterfall across 25+ providers487 emails · 412 phonesWaterfall
- Verified every email and phoneSMTP + catch-allVerification
- Added them to Series B outbound500 peopleSequences
- Posted the run to #pipelineSlackAgents
Friday 4:52 PM15 replies · 5 calls booked
Everything in the 14-day Pro trial
- Clu and agentsDescribe the job in one sentence. Clu builds the agent, runs it on a schedule or a CRM trigger and posts every run to Slack.
- People and Company SearchFind your buyers in 1B+ profiles from one sentence. Searching costs 0 credits.
- Waterfall enrichmentAsk 25+ providers in order and stop at the first verified email or phone number. 98% verified work emails and 85% phone numbers on a 500-lead benchmark.
- Email verificationRun SMTP and catch-all checks on every address before it reaches a sequence, at half a credit an email.
- ICP scoringScore every lead 0 to 100 against your ICP, with the reasons written down. The Research and Qualification skills do the digging.
- SequencesSend email from your reps' own inboxes, with call tasks. A reply stops the sequence. Sending costs 0 credits.
- CRM syncTwo-way sync with HubSpot, Salesforce and Pipedrive. Push finished lists to Outreach, Salesloft and Lemlist.
- Chrome extensionGet a verified email and phone number in one click on LinkedIn, Sales Navigator, Salesforce and HubSpot.
- MCP and APIRun the same search and waterfall from Claude or ChatGPT with 36 MCP tools, or from your own code with the REST API.
Agents that run this job
- Fill missing emailsEvery night, looks up a work email for each CRM contact that has none and writes it to the record.
- Enrich new CRM contactsFinds the missing email and phone number on new Salesforce or HubSpot contacts and writes them to the record.
- Champions who changed jobsWatches the champions in your CRM and, when one starts at a new company, finds their new work email and tells their old owner.
14 days of Pro, free: 250 credits, 3 seats, agents, Sequences and Clu in Slack. Then Free at 50 credits a month, or Starter at $49 and Pro at $89 a seat a month.
Which free email lookup tools work together?
Start from whatever you have (a name, a domain, an email or a block of text) and chain the tools until you have a verified contact.
- Reverse Email Lookupemailperson, company, profileStart with an email address and find the name, company, and public profile behind it.
- Email Permutatorname + domainevery likely addressGenerate every likely address for a person from their name and company domain.
- B2B Contact Findername + domainlikely address + patternFind business contacts and predicted email patterns by company domain.
- LinkedIn Email Finderprofile URLlikely work emailGet the likely work email behind a LinkedIn profile, ranked and MX-checked.
- Email Verifieremailverdict + scoreCheck whether any address is deliverable before you send, with syntax, DNS, and MX checks.
- Email ExtractorURL or textevery email on itEnter a website URL or paste text and pull out every email address on it, deduped.
Which paid tool does this for a whole database?
We compared the platforms that do this job for a whole database, Cleanlist AI included, and say where each one falls short.
- Best data enrichment toolsThe enrichment platforms side by side: coverage, credit costs and what each one verifies.
- Waterfall enrichment toolsHow waterfall enrichment runs a record through several providers in turn, and which tools do it for you.
- Best B2B contact database softwareContact databases compared on accuracy, refresh rate and price once your team uses them every day.
- Email appendHow email appending services recover the missing work email on a record you already hold, and what a match costs.
Frequently asked questions
Short answers about the Email Format Finder: what it checks, what it costs and where it stops.
All free toolsHow does the email format finder work?
The email format finder analyzes a company domain against email format patterns observed across public sources and provider data. It identifies which format patterns (first.last@, flast@, firstl@, first_last@, and 30+ others) are used at that organization, then ranks them by likelihood. The top-ranked format is a strong starting point, though we recommend verifying any constructed address before sending.
How accurate are the email format predictions?
Pretty accurate for most companies. Our email format finder correctly identifies the primary pattern 87% of the time on the first suggestion, and the correct format appears in the top 3 results 97% of the time. That said, format prediction is not the same as email verification, a correctly formatted address can still bounce if the person has left the company. For confirmed deliverability, use Cleanlist AI's email verification which checks each address against real mail servers across multiple providers.
Can I use this to find a specific person's email?
The email format finder shows the pattern a company uses, not individual addresses. Once you know the pattern (e.g., first.last@company.com), you can construct a likely address for any employee. For verified individual emails, confirmed via SMTP handshake and cross-referenced across 25+ providers, Cleanlist AI's People Search delivers triple-verified addresses with 98% accuracy. The format finder is the free starting point; People Search is the verified answer.
What email format do Google, Microsoft, Apple, and other large companies use?
Most of the largest tech companies use first.lastname@ as their primary employee email format. Per publicly observed conventions, Google (first.lastname@google.com), Microsoft (first.lastname@microsoft.com), Apple (firstname.lastname@apple.com), Meta (first.lastname@meta.com), Amazon (first.lastname@amazon.com), and Salesforce (flastname@salesforce.com) all followed first-and-last conventions. Smaller tech companies and startups skew toward firstname@ or flastname@ formats. Enterprise companies in finance and law more often use flastname@ or lastnamef@ patterns. Enter any domain in the tool above to see the specific pattern that company uses, ranked by confidence, without having to guess.
How do I find the email format for a private company?
Private companies without a strong online footprint are where most format finders fail. Our tool checks 34 pattern variations against any web traces (employee press releases, conference speaker bios, SEC filings, support page contacts, archived directory listings) plus the email patterns observed across provider data. If the company has at least a handful of public-facing employees, the format usually surfaces. For genuinely cold private companies with no online employee footprint, the tool returns the patterns most common for a company of that industry and size, typically first.lastname@ or flastname@ as the two most likely starting points. From there, verify the constructed address before sending to confirm it actually reaches the mailbox.
Now run it on the whole list.
Upload the CSV or describe the list you want. Clu finds, verifies and qualifies every row.
14 days of Pro, free.