The Scenario
You are a CRM analyst. You have an Excel workbook on SharePoint with 200 rows mapping Resend contact emails to segment names. Column A is email, column B is segment name.
The marketing team set up the segments in Resend last week. Every contact needs to be placed in its correct segment before the targeted campaign goes out Friday.
The bad version:
- You ask the developer to write a script that resolves contact and segment IDs from Resend, then runs the assignments
- She pulls the workbook from SharePoint, writes the script, hits a problem: Resend requires contact IDs not emails for segment assignment, so she has to chain two API calls per row
- Halfway through testing, the script errors on a segment name with a trailing space in the workbook
- You go into the weekend with eighty contacts in the wrong segments and no time to fix it.
The fast version is one prompt.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent inside your Excel workbook that reads the mapping, resolves IDs in Resend, and assigns every contact in one pass.
Open the SheetXAI sidebar and type:
Read the SegmentMap tab in this workbook where A=email and B=segment name. For each row, look up the contact ID and segment ID in Resend and add the contact to that segment. Write "added" or the error in column C.
SheetXAI iterates through all 200 rows, resolves IDs, fires the assignment, and logs the result in column C. Two hundred assignments, one prompt, column C filled with "added" for clean rows and the exact error for anything that failed.
What You Get
A completed workbook with:
- Columns A and B — email and segment name, untouched
- Column C — "added" or the Resend error message for each row
The error column tells you exactly what broke, so you are not guessing at 200 rows. If one segment name was misspelled, column C says "segment not found" for that row and the rest succeed.
What If the Data Is Not Quite Ready
Segment mapping workbooks are rarely clean. SheetXAI handles the issues and the assignments together.
When segment names in the workbook do not match Resend exactly
Some rows say "Early Adopters," others say "early adopters." Resend is case-sensitive.
Normalize the segment names in column B to title case before looking them up in Resend. For each row, add the contact to the matched segment and write the result in column C.
When some contacts do not exist in Resend yet
A few emails in column A are new and were never added as Resend contacts.
For each row, look up the contact in Resend. If the contact does not exist, create it first using the email in column A. Then add the contact to the segment in column B and write the result in column C.
When you want to run high-priority assignments first
Column C has a priority flag ("high" or "normal") and you want to test the high-priority rows before running the rest.
Filter the SegmentMap tab to rows where column C equals "high". For each row, look up the contact and segment IDs in Resend and add the contact to the segment. Log the result in column D.
When the workbook has duplicates, missing segments, and unregistered contacts all mixed together
The mapping came from three sources and was never cleaned. You want everything handled in one go.
Look at the SegmentMap tab. Remove duplicate rows where both column A and column B are identical. For each unique row, look up the contact in Resend. If it does not exist, create it. Look up the segment by the name in column B. If the segment does not exist, write "segment not found" in column C and skip. Otherwise add the contact to the segment and write "added" in column C.
The pattern: the lookup, the error handling, and the assignment all happen in one prompt. No script, no developer, no Friday panic.
Try It
Get the 7-day free trial of SheetXAI and open any workbook with email-to-segment mappings, then ask it to run the Resend assignments. The Resend integration is included in every SheetXAI plan. See also how to bulk-remove contacts from segments in Excel or the Resend in Excel overview.