Bulk Verify an Email List and Remove Invalid Entries in a Excel workbook

The Scenario

Your predecessor left the team eight months ago. In the handoff folder you found an Excel workbook titled "Trade Show Contacts Q3 2025" — 1,000 rows, first name, last name, email address, company. No verification date. No bounce rate history. The emails were collected at booths and typed into a tablet at the end of each day by whoever happened to be working the event.

You're supposed to import this list into HubSpot next Tuesday. Before that happens, you need to know how many of these addresses are actually deliverable.

The bad version:

• Save the workbook as a CSV, upload to Findymail's verification tool, wait for the batch to finish
• Download the results file, which has different column headers than your original workbook
• Open both files side by side, match rows by email, copy the verification status over, then manually delete the rows flagged as invalid

1,000 rows. Two files. Column headers that don't line up. A manual delete pass that takes an hour and introduces at least a dozen errors.

The audit is next Tuesday. The list prep shouldn't eat three days of it.

The Easy Way: One Prompt in SheetXAI

SheetXAI is an AI agent that lives inside your Excel workbook. It reads the data, calls Findymail's email verification API for every address in scope, and writes results back — or deletes invalid rows — all without leaving the workbook.

Verify every email in column B using Findymail and write the verification result to column C — then delete any row where the result is 'invalid'

SheetXAI calls Findymail's verifier for each email in column B, writes the status code to column C, and removes every row where the result came back invalid. The workbook that's left contains only deliverable addresses, already in the original format.

What You Get

• Column C populated with Findymail's verification status for every email — valid, invalid, risky, or unknown
• Rows marked invalid deleted from the workbook, leaving a clean list with no gaps or row-number shifts
• The original column structure preserved — name, email, company columns stay exactly where they were
• If you asked for a separate worksheet of rejected rows, SheetXAI moves them there rather than deleting them

What If the Data Is Not Quite Ready

Some emails are malformed or obviously bad — you want those flagged before verification even runs

Check every email in column B for basic formatting — flag any that don't contain an @ sign or have obvious typos like double dots or missing TLDs, write 'Format Error' to column C for those, then run Findymail verification on the rest and write the result to column C

SheetXAI catches the obvious bad formats first and only calls Findymail for the rows worth checking — saves credits and speeds up the batch.

You want invalid rows moved to a separate worksheet rather than deleted

Verify all emails in column B using Findymail, write the status to column C, then move every row where the status is 'invalid' to a new worksheet called 'Bounced' instead of deleting it

SheetXAI creates the Bounced worksheet if it doesn't exist, moves the rejected rows there, and leaves the main sheet with only the deliverable contacts.

The workbook has duplicates and you want to deduplicate before verifying

Deduplicate the rows in this sheet by the email address in column B, keeping the first occurrence of each duplicate, then run Findymail verification on the remaining rows and write the result to column C

SheetXAI deduplicates first — fewer rows means fewer verification calls and a cleaner final list.

You want a single pass that cleans, verifies, segments, and summarizes

Deduplicate by email in column B, fix any obvious email formatting errors, run Findymail verification on every remaining address, write the status to column C, move invalid rows to a 'Bounced' worksheet, and write a summary to cell E1 showing how many passed, how many failed, and how many were removed as duplicates

One instruction covers the entire cleanup workflow. The workbook is ready to import when it's done.

The cleanest approach is always to combine the prep and the verification in one prompt — that way nothing slips through between separate steps.

Try It

Get the 7-day free trial of SheetXAI and open any Excel workbook with a column of unverified email addresses — trade show lists, CRM exports, newsletter signups — and ask SheetXAI to run a Findymail verification pass and remove the invalid rows. For related workflows, see push contacts to a Findymail list or the Findymail integration overview.