Verifier results disagreement finder: where do two verifiers give different answers?
In short: Paste or upload the result files from two verifiers and see the agreement, a table of verdict against verdict and the addresses they split on. Limit: It compares two files; it cannot tell which verifier is right.
A verifier results disagreement finder compares two result files for the same list. It reads the address and status column in each, maps the status words (valid, deliverable, catch-all, risky, invalid, unknown) into four buckets, and shows how many addresses get the same verdict, a table of one against the other, and the addresses they disagree on. It does not say which verifier is right.
Two verifiers split on some rows. Check those rows again.
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
Sample result
Two result files agree on 2 of 4 shared addresses, and the other 2 are valid in one and invalid in the other.
- Same verdict
- 50%
- Addresses in both
- 4
- Valid vs invalid
- 2
What this means for you
A disagreement marks rows worth a second look. It does not say which verifier is right.
- Agreement across shared addresses
- A verdict-against-verdict table
- The addresses they split on
- CSV out, nothing uploaded
- Compare
- Disagree
- CSV
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
How do I settle the rows the two verifiers disagree on?
- Paste or upload both result files above to find the rows where they differ.
- 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 compare the results of two email verifiers?
- Run the same list through two verifiers and download each result file as a CSV.
- Paste or upload the first file as A and the second as B. Each needs a column of addresses and a column of status words.
- Press Compare the two files to see the agreement, the verdict-against-verdict table and the disagreements.
- Download the disagreements, or check them again to see which way they fall.
Example
- You enter
- Two result files for five addresses: file A says valid, catch-all, invalid, valid, unknown; file B says deliverable, risky, deliverable, undeliverable and has a different fifth address.
- You get
- 4 addresses in both files, 2 with the same verdict (50%), 2 disagreements, and both disagreements are valid against invalid. A table of A against B and a CSV of the disagreements.
- Limits
- It does not say which verifier is right. Statuses are mapped into four buckets by their words, and ones it does not recognise are skipped. Runs in your browser.
How are the statuses compared?
Each verifier uses its own words, so the tool maps them into four buckets. Words such as invalid, undeliverable, bad and bounce count as invalid; catch-all, accept-all, risky, role and disposable count as risky; unknown, unverifiable and retry count as unknown; valid, deliverable and good count as valid.
Rows are matched on the address in lowercase. Addresses in only one file are counted separately and left out of the agreement figure.
What does a disagreement mean?
It means two checks gave different answers at the time they ran. Mail servers change, some domains accept every address and some providers do not allow an honest check, so different tools can read the same address differently. A row marked valid by one and invalid by the other is the pair to look at first.
For a fair way to run the test, see how to bench test email verifiers, and for what to do when results differ, two verifiers gave different results on my list.
What can it not tell you?
It cannot say which verifier is right. Only mail that is sent, or another live check at the time you need it, settles that. Check the disputed rows and see which way they fall.
Who uses this tool, and for what?
- Cold emailers
- Compare a free check against a paid one before choosing which to trust for a campaign.
- Agencies
- Show a client where their old verifier and yours differ on the same file.
- Data teams
- Find the rows to review when a vendor's results and your own checks do not match.
What can’t this tool tell you?
- It compares two files; it cannot tell which verifier is right.
- Statuses are mapped by their words into four buckets, so a verifier's finer labels are merged.
- Statuses it does not recognise are skipped.
- Both files should hold the same list; only shared addresses are compared.
Common questions
- Does it tell me which verifier is better?
- No. It shows where two files differ on the same addresses. Which one is right for a given address can only be settled by a live check or by sending.
- What columns do the files need?
- A column of email addresses and a column of status words. A header such as status, result or verdict is picked up automatically; otherwise the column with the most status words is used.
- How are different status words handled?
- They are mapped into valid, risky, invalid and unknown. Statuses it does not recognise are skipped and not counted.
- What if the files hold different lists?
- Only addresses with a readable status in both files are compared. Addresses in one file only are counted separately.
- Why would two verifiers disagree?
- They ran at different times, use different checks, and treat catch-all domains and large webmail providers differently. A disagreement is a reason to look again, not proof that one is wrong.
- Is anything uploaded?
- No. Both files are read in your browser and nothing is sent anywhere.
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.