Playbook
Email triage for a small Gmail inbox with ChatGPT
Direct answer
Use Gmail labels and filters to sort a small inbox, then a ChatGPT Project to draft replies you still send yourself. It fits a sole trader under about fifty messages a day. Do not give the agent permission to send. This setup has not been timed in a live test.
- Time to set up
- 45–90 minutes
- Difficulty
- beginner
- Monthly cost, USD
- $0–$20
- Monthly cost, GBP
- about £0–£15
- Last tested
- Not yet tested
- Updated
- 24 October 2026
The Gmail part is free with the Google account you already have. ChatGPT's free plan can draft a light inbox until you hit the cap. Plus was listed at $20 a month before tax in October 2026, about £15 at this site's planning rate. Confirm the current plan names on the pricing page.
GBP figures are a budgeting conversion at £1 = $1.33 and €1 = £0.86, rounded to the nearest pound, fixed for this edition on 24 October 2026. They are not a live rate and not a quote. Vendor list prices are usually quoted before tax.
Primary tool: ChatGPT · Also uses Gmail
ConsultantsAgenciesCoachesAccountants
Who it is for
A sole trader or a very small team with one inbox, mostly ordinary customer and supplier mail, and no appetite for an agent that sends on its own.
The sort is the product. An agent on top of an unsorted inbox just writes faster replies to the wrong messages. Spend the first half of the setup on labels. If you stop after the filters and never open ChatGPT, you have still improved the week.
When a thread is angry, about money you dispute, or from a lawyer, do not paste it in. Reply yourself, or ask someone qualified. The Project is for the ordinary pile: "can you do Thursday", "please resend the invoice", "what is the price of the standard package".
What you need
- A Gmail or Google Workspace inbox you control.
- A ChatGPT account. A paid plan is optional until the free cap gets in the way.
- Half an hour when you can look at real mail, not a theoretical inbox.
Step by step
01
Create four labels
In Gmail, create four labels: Now, Waiting, FYI, and Receipts. Now is mail that needs a reply or a decision today. Waiting is mail you have answered and are expecting someone else to move. FYI is newsletters and notifications. Receipts is anything that belongs in the books. The inbox stays for mail you have not sorted yet.
02
Filter the obvious noise
Use Gmail's filters to send known newsletters to FYI and skip the inbox, and to send known receipt senders to Receipts and skip the inbox. After each filter, open one real customer thread and check it would not have matched. A filter that hides a paying customer is worse than an untidy inbox. Change one filter at a time so you can see what broke.
03
Decide what the agent may see
Do not paste health information, children's data, payment card numbers, or a client's confidential files into a consumer ChatGPT plan. Ordinary enquiries from adult customers are a more reasonable use, and you are still the controller of that personal data. In settings, turn off any control that lets your chats train the general model, if you can find one. If client mail is constant, look at a business plan that offers a data-processing agreement before you make this a habit.
04
Write a one-page brief in a Project
Create a ChatGPT Project called Inbox drafts. In the instructions, state your name, trade, the prices you are willing to put in writing, your working hours, and the tone you actually use. Add three rules: do not invent a price, a date, or a promise; if the answer is not in the brief, say so; produce a reply plus a separate line that starts with Check, listing anything you must verify. Paste two old replies you were happy with, with the names removed.
05
Draft, then send from Gmail
For each Now message, copy the thread into the Project and ask for a reply. Read the Check line before you read the draft. Edit it in Gmail and send it yourself. Move the thread to Waiting if you are owed a response, or archive it if it is done. If a screen offers to send without review, leave it off. The agent does not get a send button.
06
Review the labels once a week
On a Monday, open Waiting and FYI. Waiting should be short. FYI can be scanned and mostly deleted. If Now is always huge, the filters are too timid or the work is not an agent problem: you need a shorter list of what only you can decide. Adjust one filter a week.
What can go wrong
A filter eats a customer
Newsletter filters are greedy. If a subject contains the word update, a real client can vanish into FYI. Search FYI for your own name once a week during the first month.
The draft agrees a price
If the brief does not list your prices, the model will often invent a reasonable-sounding one. That is why the Check line exists. If it is empty and the reply mentions money, do not send it.
Send permission sneaks on
Connectors and agent modes are renamed often. Any control whose description includes sending, replying, or acting in Gmail stays off for this playbook.
UK notes
Costs, including VAT
Budget nothing if the free ChatGPT plan is enough, or about £15 a month for Plus at the planning rate of £1 = $1.33. Google Workspace, if you want a custom domain, is a separate bill. US vendors often show a price before tax. If you are VAT-registered, a software invoice from overseas may fall under the reverse charge, which you account for and may reclaim if the software is for taxable business use. If you are not VAT-registered, you cannot reclaim it, and some checkouts add UK VAT. Read the invoice. This is not tax advice.
Data flow
The thread you paste is personal data when it identifies a customer. It goes from your browser to OpenAI. OpenAI describes its own processing in its privacy policy, and international transfers need a lawful basis and an appropriate safeguard under UK GDPR. Do not paste special-category data. Keep Gmail as the record of what you actually sent. A chat transcript is not your filing system.
HMRC and Making Tax Digital
A software subscription used wholly for the business is normally an allowable expense, but that is a question for your accountant or for HMRC's expenses guidance, not for this page. Email triage does not file a return and it is not a Making Tax Digital tool. Making Tax Digital for Income Tax is a separate duty for some sole traders from April 2026, based on qualifying income. It does not change how you should sort an inbox.
Practical orientation for a UK reader. Not tax, legal, or accounting advice.
Test log
Status: Pending first test
24 October 2026 · pending
Pending first test. The steps were compiled from Gmail and OpenAI documentation and have not been run end to end on a live business inbox.
Sources
- Gmail Help — create rules to filter your emails — accessed 24 October 2026
- ChatGPT pricing — accessed 24 October 2026
- OpenAI privacy policy — accessed 24 October 2026
- ICO — guide to UK GDPR — accessed 24 October 2026
Disclosure
AgentShed is independent and this playbook is not sponsored. There is no affiliate link on this page. If that changes, the link will use rel="sponsored" and a sentence beside it will say so. The verdict is not for sale.
Questions people ask
Can the agent send the replies?
Not in this setup. Sending is the decision. A wrong promise about price or timing is much more expensive than the minute it takes to read a draft.
What if I already pay for Google Workspace?
Use that inbox. The labels and filters are the same idea. You do not need a second mailbox for the agent.
Is fifty messages a hard limit?
No. It is a description of the inbox this is written for. A shared support inbox with hundreds of threads a day needs a proper helpdesk, not a Project and a copy-paste habit.
Was this useful?
Related playbooks
Compare the tools
When this page is re-tested
One email when the log changes. No sequence of lessons.