The Scenario
It is the third week of the month and your law firm's renewal notice letters are overdue. The Clients sheet has 80 rows — name in column A, street through ZIP spread across columns B to E. Each client needs a personalized letter with their name merged into the body. The Stannp template is built. What is missing is the bridge from the sheet to the send.
The bad version:
- Download the sheet as a CSV, reformat the column headers to match Stannp's mail-merge field names, realize that two clients share the same last name and their rows have slightly different address formatting that will cause the merge to break.
- Upload the CSV to Stannp's letter endpoint, find that the template field names do not match what you exported, go back to the sheet and rename the columns, re-export, re-upload.
- Wait for the batch to process, copy the returned mailpiece IDs into a separate tracking document, and send a Slack message to the paralegal to confirm the run is done.
This is not a technical problem. It is a coordination overhead problem that nobody in a law firm was hired to solve. The senior associate who owns this list is billing hours, not running mail merge QA.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent inside your Google Sheet. It reads your client list, calls the Stannp letter API with the right field mapping, and writes the mailpiece IDs back into the sheet for you.
For each row in the Clients sheet, send a Stannp letter using recipient name from column A, street from column B, city from column C, state from column D, ZIP from column E, and template 73104 — write the returned mailpiece ID and status into columns F and G.
What You Get
- A mailpiece ID in column F and a send status in column G for every client row.
- Any send failures appear in column G with the error message, so the paralegal can fix the address and rerun those specific rows without touching the rest.
- The record stays in the sheet — no separate tracking doc, no Stannp export needed to reconcile.
What If the Data Is Not Quite Ready
Client names stored as a single full-name column
Split the full name in column A into first name and last name — if there are two words, use the first as first name and second as last name; if there are three or more, use the last word as last name and the rest as first name — then send a Stannp letter using template 73104 with the split name, street from B, city from C, state from D, ZIP from E, and write the mailpiece ID and status into columns F and G.
Missing ZIP codes for some rows
Flag any rows in the Clients sheet where column E is blank or fewer than 4 characters by writing Missing ZIP into column G, then send a Stannp letter using template 73104 to all remaining rows and write the mailpiece ID and status into columns F and G.
Clients spread across two sheets needing a join
Join rows from the Active tab (columns A through E) with the Do Not Mail list in the Excluded tab (column A) and send a Stannp letter using template 73104 only to clients not on the excluded list — write the mailpiece ID and status into columns F and G of the Active tab.
Full cleanup, dedup, and send in one pass
Remove duplicate rows from the Clients sheet based on the address in columns B through E, trim whitespace from all address fields, flag rows with missing values in column G, then send a Stannp letter using template 73104 to all clean rows and write the mailpiece ID and status into columns F and G.
Combining the cleanup and the send in one prompt means both steps happen in the same state of the data, with no gap for drift between runs.
Try It
Get the 7-day free trial of SheetXAI and open any Google Sheet with a client or contact list and ask it to send personalized letters via Stannp. For postcard sends, see the bulk-send postcards spoke. For the hub overview, see How to Connect Stannp to Google Sheets.