Sequential email address finder: user1, user2, user3 on one list
In short: Upload a list or paste a column of addresses and see every run of addresses that differ only by a counting number on one domain, with its first address and length. Limit: It reads the text only and cannot say whether a mailbox exists.
Upload a list or paste a column of addresses and the tool finds runs where the part before the @ is the same word followed by a counting number on one domain, such as user1, user2 and user3. You choose the shortest run to flag, see each run, and download the list with a flag column.
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. Check your list free nowSee pricing
Three or more is usual; two is the lowest.
Sample result
Nine example addresses hold 2 runs that count up: user1 to user4 and lead01 to lead03.
- Runs found
- 2
- Addresses read
- 9
- Shortest run
- 3
What this means for you
Counting names often come from scripts or guessed lists, so look at them before a send.
- You set the run length
- One domain per run
- Leading zeros handled
- List with a flag column
- Patterns
- Bots
- Lead list
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
Runs found, now check which mailboxes exist.
- Download the list with its flag column, or use the check button under the result.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I find sequential email addresses?
- Upload the list as a CSV or .xlsx, or paste the cells with the header row first. It needs a column of email addresses.
- Choose how many in a row make a run, three by default, and press Find the runs.
- Read each run: the word, the domain, the numbers it covers and how long it is.
- Download the list with a flag column, look at the flagged rows, then check the mailboxes.
Example
- You enter
- Example list of nine addresses: user1 to user4 at example.com, ava.stone at example.com, lead01 to lead03 at example.org and ben at example.net, with runs of 3 or more flagged.
- You get
- Nine addresses read, 2 runs found covering 7 addresses: user1 to user4 on example.com (4 addresses) and lead01 to lead03 on example.org (3 addresses).
- Limits
- Runs in your browser. A run is a place to look, not proof that the addresses are fake.
What is a run?
A run is a set of addresses on one domain whose names are the same text plus a number that goes up by one each time: trial1@, trial2@, trial3@. Numbers that skip, such as 1, 2 and 5, break the run. A run needs at least the number you choose, and two is the lowest you can set.
Why do runs matter?
Counting addresses come from scripts, guessed lists and shared test accounts. Most of the numbers in a guessed run do not exist, so they bounce. Others are real mailboxes at one company, which is a small group to send to, not a large one. Look at the flagged rows before you send, and read stop fake signups if the run is in your sign-ups.
How are the rows read?
Each address is lower-cased and exact duplicates are counted once. A name that ends in digits is split into its word and number. Names that end in a long number such as a birth year are still read, so look at runs of years with care; for those, use the email address pattern analyzer.
Who uses this tool, and for what?
- Cold emailers
- Spot guessed address runs on a bought list.
- Newsletter owners
- Find scripted sign-ups that count up on one domain.
- Data teams
- Mark test accounts such as test1 to test9 before an import.
What can’t this tool tell you?
- It reads the text only and cannot say whether a mailbox exists.
- Only numbers up to nine digits are read.
- Runs must go up by exactly one; a gap ends a run.
- Real team mailboxes can also count up, so a run is a place to look, not a verdict.
Common questions
- Does a run mean the addresses are fake?
- No. It means the names count up, which is common for scripts and guessed lists but can also be real team mailboxes.
- How many addresses make a run?
- Three by default. You can set it from two upward.
- Are leading zeros handled?
- Numbers are compared by value, so user01 and user02 are in one run.
- Does it join runs across different domains?
- No. A run is on one domain.
- Does it read the whole list?
- Yes, every row is read.
- Is my list uploaded anywhere?
- No. The list is read in your browser.
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.