The Scenario
An email deliverability consultant is doing intake on a new client account. The client has 800 B2B email addresses in an Excel workbook they want to send a campaign to next week. The open rates on the last campaign were bad. The deliverability score is worse.
The consultant suspects catch-all domains are part of the problem. When a domain is configured to accept all incoming email regardless of whether the mailbox exists, verification tools return "valid" — but the address might still bounce. Sending to a list full of catch-all domains without flagging them first is how you end up on a suppression list.
The bad version:
- Save the workbook as a CSV, run it through Clearout's dashboard, download the catch-all results.
- Open both files, look for the "catch-all" status rows, build a filtered version of the workbook.
- Give the client two separate files — the original and the filtered version — and explain why the numbers don't match.
The consultant has run this intake process a dozen times. The export-and-reconcile loop never gets cleaner.
There is a cleaner version that stays in the workbook the client already sent over.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent that lives inside your Excel workbook. It reads the email column, extracts each domain, calls Clearout's catch-all detection for each one, and writes the result back — all without leaving the workbook.
Try this yourself — free for 7 days
SheetXAI installs in your Excel workbook in about a minute. Paste the prompt below and watch it run.
For each email in column A, use Clearout to check if the domain is a catch-all server and write "catch-all" or "not catch-all" into column B.
What You Get
- Column B: "catch-all" for domains configured to accept all email, "not catch-all" for domains with proper MX rejection behavior
- Each label is tied to the domain of the email in column A, not the address itself
- Rows where the domain check returns an error get an "error" label rather than a silent blank
- The check is domain-level, so 40 addresses at the same domain all produce the same result efficiently
What If the Data Is Not Quite Ready
Some email addresses in the column are already marked invalid from a prior run
Skip any row in column A where column B already contains "invalid" from a prior verification pass. For all remaining rows, use Clearout to check catch-all status and write "catch-all" or "not catch-all" into column C.
I want to group the results by domain so the client can see the catch-all domains at a glance
For each email in column A, extract the domain, check it for catch-all status with Clearout, write "catch-all" or "not catch-all" into column B, then create a summary worksheet that lists each unique domain once with its catch-all status and the count of contacts from that domain.
I want to deprioritize catch-all contacts without deleting them
Use Clearout to check catch-all status for all emails in column A, write the result into column B, then add a "send tier" column C where catch-all rows get "tier 2" and non-catch-all rows get "tier 1" — so the client can sequence sends by tier.
Full deliverability audit in one prompt
For every email in column A, run full Clearout verification to get status into column B, sub-status into column C, and catch-all detection into column D. Flag all catch-all rows in column E as "warm-up first," flag invalid rows as "suppress," and write a summary at the bottom: total audited, total suppress, total warm-up first, total safe to send.
One prompt produces a deliverability-ready workbook the client can hand to their ESP directly.
Try It
Get the 7-day free trial of SheetXAI and open any Excel workbook with a prospect list before a high-stakes send — and ask it to run catch-all detection with Clearout. From there, you might want to verify the full list or check the Clearout hub for everything else this integration can do inside a workbook.