The Scenario
The reactivation campaign is coming up. Your e-commerce brand mails quarterly win-backs to customers who haven't purchased in six months, and the CRM just dropped a 10,000-row export into an Excel workbook — customer ID, name, email, last purchase date, lifetime value.
Six months of no email means six months of no engagement signals. Some of those addresses have gone dark. Some inboxes were abandoned. Some domains stopped renewing. Before you spend budget on a win-back campaign, you need to know which addresses are actually worth sending to.
The bad version:
- Export the email column to yet another CSV, upload to a standalone verifier, wait for results, download them.
- Try to VLOOKUP 10,000 results back into a workbook that already has 10 columns and pray the sort order didn't shift.
- Build a separate "Sendable" worksheet by hand — copying rows one filter at a time, then double-checking that all original columns came through intact.
The email manager at a brand doing quarterly win-backs shouldn't be spending a full afternoon on spreadsheet hygiene. The campaign performance question is interesting. This part isn't.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent inside your Excel workbook that reads the data and talks to Mailcheck for you. It can run verification across all 10,000 addresses, append the results inline, and build a filtered output worksheet — in one ask.
Verify all emails in column A using Mailcheck and add a DELIVERABLE column (Yes/No) and a RISK column (low/medium/high) based on the verification result — then add a count at the bottom showing how many are deliverable vs not
What You Get
- A new DELIVERABLE column: "Yes" for addresses that pass Mailcheck's verification, "No" for those that don't.
- A new RISK column: "low", "medium", or "high" based on Mailcheck's risk assessment.
- A summary row at the bottom of the data: total addresses verified, count deliverable, count not deliverable.
What If the Data Is Not Quite Ready
Some rows have email addresses with internal formatting artifacts — extra spaces, double @ signs, or placeholder values like "N/A"
Before running Mailcheck verification, scan column A for values that don't match a valid email pattern (no @, double @, trailing spaces, "N/A", "none", or blank). Mark those rows "SKIPPED" in the DELIVERABLE column and exclude them from the Mailcheck calls. Then verify the remaining rows and write DELIVERABLE and RISK columns as normal.
The CRM export has customers from both the US and EU sites — I want separate deliverability breakdowns by the REGION column in column F
Run Mailcheck on all emails in column A, write DELIVERABLE and RISK to new columns. Then write two summary counts: one for rows where column F is "US" and one for rows where column F is "EU" — show deliverable vs not for each region.
I want a ready-to-upload worksheet with only the deliverable rows, keeping all original columns
Use Mailcheck to validate each email in column A, then create a new worksheet called "Sendable" containing only the rows where the email passed verification. Preserve all original columns. Add a header row and a count in cell A1 of the Sendable sheet showing how many rows it contains.
Verify the list, score by risk, remove high-risk and undeliverable addresses, flag medium-risk rows for manual review, and write a campaign-ready summary
Verify all emails in column A with Mailcheck. Delete rows where DELIVERABLE is No or RISK is high. For rows where RISK is medium, add "Manual review" in a new NOTES column. Create a "Sendable" worksheet with the remaining low-risk deliverable rows. Then write a summary in cell A1 of the original sheet: total verified, removed, flagged for review, moved to Sendable.
That's the verification, the triage, the filtering, and the campaign-ready output — in a single instruction.
Try It
Get the 7-day free trial of SheetXAI and open the Excel workbook with your CRM export, then ask it to verify the email column with Mailcheck and build a Sendable worksheet before your win-back campaign goes live. Also see how to bulk verify lead emails before importing and the full Mailcheck integration overview.