The Scenario
You ran an in-person event last Thursday — 1,200 registrants, most of them Dutch B2B contacts. The post-event newsletter is supposed to go out tomorrow. The attendee list is sitting in an Excel workbook: column A is email, column B is first name, column C is company name, column D is city. The Laposta list it needs to land in is called Post-Event-2024.
The bad version:
- Export the worksheet as a CSV, then spend 15 minutes cleaning it in a text editor because Laposta's import screen chokes on company names that have a comma
- Upload the cleaned file, map the columns one by one in the wizard, discover that "company" needs to match an existing custom field called "bedrijf" not "company"
- Re-export with the corrected column header, reimport, check the error log for skipped rows, manually add the 11 that failed
The newsletter goes out tomorrow whether that list is clean or not. You don't have a spare afternoon to debug a CSV import wizard, and you certainly don't have the budget to hire someone just to move a spreadsheet into a mailing list.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent inside your Excel workbook. It reads your data, understands the column layout, and talks to Laposta on your behalf — adding each subscriber directly via the API rather than routing through a CSV upload. No field-mapping wizard. No re-export loop.
Add all rows from Sheet1 as new members of Laposta list Post-Event-2024 — use column A as email, column B as first name, column C as company (custom field), skip any row missing an email
What You Get
- Every row with a valid email is added to the Post-Event-2024 list as an active member
- First name lands in the standard name field, company name in the custom "bedrijf" field
- Rows missing an email in column A are skipped, with "skipped — no email" written to column E so you can follow up
- A summary count appears in the SheetXAI sidebar: 1,189 added, 11 skipped
What If the Data Is Not Quite Ready
Some rows have the first and last name combined in one cell
Before adding to Laposta, split column B on the first space — put the first part in a new column B and the remainder in a new column C, then use B as first name and C as last name when importing to list Post-Event-2024
The company column has inconsistent capitalization
Normalize column C to title case, then upsert all rows into Laposta list Post-Event-2024 matching on email — set custom field "bedrijf" from column C and custom field "city" from column D
Attendees came from two separate worksheets
Pull all rows from Sheet1 and Sheet2, deduplicate on column A (email), then add unique contacts to Laposta list Post-Event-2024 with first name from column B and company from column C
Clean up placeholder emails, normalize names, and import in one shot
In Sheet1, remove any row where column A contains "test", "example", or "@placeholder"; trim whitespace from columns B and C; then add all remaining rows to Laposta list Post-Event-2024 using column A as email, column B as first name, column C as company custom field
The pattern holds: describe the cleanup and the destination together. One prompt, one result.
Try It
Get the 7-day free trial of SheetXAI and open your attendee workbook, then ask it to push contacts into your target Laposta list by name. From there, explore pulling campaign stats back into the workbook or scaffolding custom fields from a definition table.