The Scenario
Your marketing ops manager received a data append from a third-party enrichment vendor. Company size and industry for 800 existing subscribers, delivered as an Excel file. She needs those values written into the corresponding Moosend custom fields without re-importing the full list and overwriting everything else.
The bad version:
- Export the current list from Moosend to see what's already there
- Write a VLOOKUP to join the enriched file with the export on email address
- Find 60 emails that don't match because of formatting differences — fix them manually, redo the lookup
- Re-upload the entire merged file as a new import, then discover Moosend treated it as an add rather than an update
The enrichment data is sitting in a workbook. It should take ten minutes. It's taken an afternoon.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent that lives inside your Excel workbook. It reads the enriched data from your worksheet, connects to Moosend through its built-in integration, and updates the custom field values for each subscriber by email — no full re-import, no overwriting unrelated fields.
Read the 'Subscriber Updates' Excel table and update each Moosend subscriber email in column A with the plan_tier value in column B for mailing list ID xyz789
What You Get
- Each subscriber in Moosend gets their custom fields updated to the values from the workbook
- Subscribers not found in the list surface as errors so you can investigate
- Only the specified custom fields change — every other field on the subscriber record stays untouched
- The update runs row by row across all 800 records without you clicking anything
What If the Data Is Not Quite Ready
Company size values need to be normalized before updating
For each row in the 'Enriched Subscribers' worksheet, normalize the company_size in column B to one of 'small', 'mid', or 'enterprise' based on the raw value, then update the Moosend subscriber in list ID abc123 — write 'UPDATED' or 'ERROR' into column D
Some emails have trailing whitespace from the vendor file
Trim any leading or trailing whitespace from emails in column A of the 'Enriched Subscribers' worksheet, then update the Moosend subscriber in list ID abc123 with company_size from column B and industry from column C
The enriched file covers two lists
For each row in the 'Enriched Subscribers' worksheet, update the Moosend subscriber with the email in column A — check list ID abc123 first, then list ID xyz789 if not found — set company_size from column B and industry from column C — write 'UPDATED (abc123)', 'UPDATED (xyz789)', or 'NOT FOUND' into column D
Full enrichment push: normalize, dedup, update, and report
In the 'Enriched Subscribers' worksheet — trim emails in column A, normalize company_size in column B to 'small'/'mid'/'enterprise', deduplicate by email keeping the last row, then update each Moosend subscriber in list ID abc123 — write 'UPDATED' or 'NOT FOUND' into column D and write the total updated count into cell F1
Handling normalization and deduplication in the same prompt means the enrichment data lands clean in Moosend without a pre-processing step.
Try It
Get the 7-day free trial of SheetXAI and open an Excel workbook with your enriched subscriber data, then ask SheetXAI to push the custom field updates into Moosend. See also the Export All Subscribers spoke or the full Moosend overview.