The Scenario
You are a support rep. Your queue has 20 open Gmail threads from customers who submitted questions 5 to 10 days ago and have not heard back yet. Thread IDs are in column A of a Google Sheet. Column B has the follow-up message you want to send to each one: a short, warm check-in.
It is 9:15 AM. Your SLA window closes at 10:00 AM. Forty-five minutes to send 20 replies.
The bad version:
- You paste the first thread ID into Gmail's search bar
- Gmail does not search by thread ID — you have to find the thread from the sender's name instead
- You click into the thread, click Reply, paste the message from column B, click Send
- Back to the sheet, next row
- Twenty threads. You make it to 14 before the SLA window closes. Six customers do not get their follow-up.
The fast version is one prompt.
The Easy Way: One Prompt in SheetXAI
SheetXAI reads the thread IDs and message text from your sheet and sends each reply via Gmail's API, so you are not clicking through threads one by one.
Open the SheetXAI sidebar and type:
Reply to each Gmail thread in column A of this sheet using the message text in column B. Send from my Gmail account, keep the same subject line to stay in thread. Write "replied" or "error" into column C when done.
SheetXAI reads each thread ID, fetches the thread to get the correct subject and recipient, sends the reply with the text from column B, and writes status into column C. Twenty threads, done before 10 AM.
What You Get
20 replies sent, each staying inside the correct Gmail thread:
- Thread continuity — the reply uses the original subject line, so it stays in the thread for the customer
- Column C — "replied" or "error" per row
- Correct recipient — SheetXAI addresses the reply to the last sender in the thread, not to a static address
If a thread ID has no valid last sender (e.g. the thread is from a mailing list), the row shows "error" instead of sending to the wrong address. You see exactly what failed.
You can ask SheetXAI to vary the reply text per row if column B has different messages for different customers.
What If the Data Is Not Quite Ready
Thread reply operations have edge cases that break simple mail merge tools.
When some threads already have a recent reply from you
You do not want to double-reply to a thread you already answered yesterday.
For each thread ID in column A, check if the last message in the thread was sent by me. If it was, write "already replied — skipped" in column C. If the last message was from a customer, send the reply from column B and write "replied" in column C.
When the reply text needs to reference the original question
Column B has a generic check-in, but you want to include the customer's original subject line in the body.
For each thread ID in column A, get the original subject line from the first message in the thread. Insert it into the message from column B at the placeholder [SUBJECT]. Send the reply to the last sender and write status into column C.
When you want to send different follow-ups based on how long the thread has been open
Column C has the date the thread was opened. You have two templates: one for threads open 5-7 days, one for 8+ days.
For each thread, check the date in column C. If the thread has been open 5 to 7 days, use the message in column D as the reply body. If it has been open 8 or more days, use column E. Send the reply, stay in thread, write status into column F.
When you want to preview all replies before any are sent
You are not sure if the column B messages are polished enough. You want to review before firing.
For each thread ID in column A, fetch the last sender's email address and write it into column C. Do not send anything yet. When I say "send", use the message in column B to reply to each thread.
The pattern: the thread IDs are the key. SheetXAI resolves them to real Gmail threads, sends contextually correct replies, and reports back — without you clicking into a single email.
Try It
Get the 7-day free trial of SheetXAI and open any sheet with Gmail thread IDs and reply text, then ask it to send the replies. The Gmail integration is included in every SheetXAI plan. For related workflows, see how to pull Gmail thread details into a sheet for triage or the Gmail in Google Sheets overview.