The Scenario
Your CRM admin finished the export — 2,000 contacts, every email address your team has collected over the past year across webinars, form fills, and event sign-ups. The sheet is in Excel. The campaign is scheduled to send Thursday. Your deliverability consultant just flagged that your last send had a 4.2% bounce rate, and your ESP is making noises about account suspension.
You need every email in column A checked before Thursday. Syntax, domain validity, and disposable address detection — all three.
The bad version:
- Export the email column to a CSV, upload it to an email validation tool, wait for the results
- Download the results file, open it alongside the workbook, cross-reference rows by email string
- Discover that 40 addresses appear with different formatting in the results file than in the workbook (trailing spaces, encoding differences) and the match fails
It's Tuesday. Thursday is closer than it looks.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent that lives inside your Excel workbook. It reads column A, runs Neutrino email validation on every row, and writes the result and issue type into the columns you specify — inline, no re-importing.
For each email in column A, use Neutrino to validate it and put the result (valid or invalid) in column B and any issue found (syntax, domain, or disposable) in column C.
What You Get
- Column B: valid or invalid for every row — no blanks
- Column C: the specific failure type — syntax, domain, or disposable — populated where relevant
- Any row Neutrino cannot process is surfaced explicitly so nothing slips through before the send
- Column A stays untouched — your source data is intact
What If the Data Is Not Quite Ready
Some emails have leading or trailing whitespace
Trim all values in column A first, then validate each one with Neutrino and write the result to column B and the issue type to column C.
Some rows contain two emails in one cell separated by a semicolon
For each row in column A, if the cell contains a semicolon, split it into two emails, validate both with Neutrino, and write the worse result to column B — flagging the row with SPLIT in column D so you can review the pair.
You want to cross-check the domain portion against a domain column you already have
For each email in column A, validate it with Neutrino. Also check whether the domain portion matches the value in column B. Write the validation result in column C and flag any domain mismatch with MISMATCH in column D.
Clean, validate, and summarize in one shot
Trim whitespace from all emails in column A, run Neutrino validation on each, write valid or invalid in column B and the issue type in column C, then add a summary row below the data showing the total count of valid, invalid, syntax-error, domain-error, and disposable addresses found.
Try It
Get the 7-day free trial of SheetXAI and open your Excel contact workbook, then ask SheetXAI to validate column A with Neutrino before Thursday's send. Check out the SMTP deliverability verification spoke if you want to go beyond syntax and domain checks and confirm actual mailbox deliverability.