Bulk email format finder: every company's email format from your lead list
In short: Reads names and addresses from a lead CSV, works out each company domain's format from 14 common patterns, and flags the addresses that break their company's format. In your browser. Limit: It reads text; a format that fits doesn't mean the mailbox exists.
A bulk email format finder reads a lead list and works out the email format each company uses, such as first.last or flast, from the names and addresses already in it. Upload a CSV with name and email columns: every company with two or more named addresses gets a format and a count, and addresses that don't follow their company's format are flagged to check.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. See pricing
Sample result
northwind.example uses first.last (3 of 4); contoso.example uses flast (2 of 3).
- Company formats
- 2
- Fit their format
- 5
- Personal or one-off
- 2
What this means for you
thart@ and info@ don't follow their company's format. Check them before sending.
- Names and emails from a CSV
- Format per company domain
- Off-format addresses flagged
- Formats table as a file
- first.last
- flast
- CSV
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
A format fits. Does the mailbox exist?
- Fitting the company's format doesn't make an address real; off-format ones need a closer look.
- Upload the list at /verify for a live mailbox check on every address.
- The first 100 email checks are free with a Google sign-in, no card.
How do I find the email format of many companies at once?
- Upload or paste a CSV with an email column and first and last name columns, or one full name column.
- Press Find the formats. Each address is compared with 14 common formats built from its row's name.
- Read the format per company domain, with how many named addresses fit it, and each address's result.
- Download the formats by domain, or every row with its result, and check the off-format addresses.
Example
- You enter
- A 9-row CSV with first_name, last_name and email: 4 people at northwind.example (3 as first.last,
thart@), 3 at contoso.example (kpark@,bstone@,info@), 1 Gmail and 1 at fabrikam.example. - You get
- northwind.example: first.last, 3 of 4 fit;
thart@uses a different format (flast). contoso.example: flast, 2 of 3 fit;info@fits no name format. fabrikam.example has only one named address, so no format. The Gmail row is personal. - Limits
- Runs in your browser with no row cap; an uploaded file can be up to 25 MB.
How is a company's email format worked out?
From the addresses you already have. For each row with a name and a company address, the part before the @ is compared with 14 formats built from that name: first.last, firstlast, flast, f.last, first, firstl and the rest (see common email address patterns). Names are folded to plain letters first, so José O'Brien becomes jose and obrien. The format most named addresses at a domain fit is that company's format; a domain needs two named addresses before it gets one.
Free mailbox domains such as gmail.com are left out, since there's no company format to find. For one company with a handful of known addresses, the email format finder does the same with a paste box.
What does an off-format address mean?
Either the address fits a different format than the rest of the company, or it fits none: a role inbox such as info@, a nickname, an address from before the company changed its scheme, or a guess from a lead database. None of those are wrong for certain, which is why they're flagged rather than removed. A mailbox check settles it; if the off-format address bounces, the company's format is the first thing to try instead.
Is this faster than an email format lookup site?
| This tool | Format lookup per company | |
|---|---|---|
| Companies per run | Every domain in the file | One search each |
| Source of the format | Your own named addresses | The site's own database |
| Addresses that break the format | Flagged | Not shown |
| Where it runs | In your browser | On their server |
Who uses this tool, and for what?
- Cold emailers
- Spot guessed addresses in a purchased or scraped list because they break their company's format.
- Agencies
- Build a format table for every account in a client's CRM before enriching the missing contacts.
- Recruiters
- Learn a company's format from the few addresses you have, then write to new people there.
What can’t this tool tell you?
- It reads text; a format that fits doesn't mean the mailbox exists.
- Companies with one named address on the list get no format.
- Two people with the same initials, or hyphenated and middle names, can fit a different format than the company uses.
Common questions
- How do I find a company's email format?
- Collect two or more addresses of named people at the company and see which pattern they share. This tool does that for every company in a lead file at once.
- What are the most common email formats?
- first.last (jane.doe), flast (jdoe), first (jane) and firstlast (janedoe) cover most companies. The tool checks 14 patterns, including last.first, first_last and first-last.
- Why does a company show no format?
- Either it has only one named address on the list, or its named addresses fit none of the 14 patterns. Add more rows for that company, or use the email permutator to try every pattern for a name.
- What does it need in the file?
- An email column and either first and last name columns or one full name column, with a header row. Other columns are kept in the download.
- Is the file uploaded?
- No. It runs in your browser. Only the optional mailbox check at the end sends the addresses, after you press the button and sign in.
Sources
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.