How to use AI to draft replies to customer emails.

What AI drafting does well, and where it stops

AI drafting is good at the parts of email that take time without taking thought:

• Turning your saved answer into a reply that fits this customer's question.
• Shortening a long reply, or making a blunt one friendlier.
• Summing up a long thread before you answer it.
• A first draft for routine emails: opening hours, moving a booking, what to bring, a polite follow-up.

It stops where your business knowledge starts. It does not know your prices, your cancellation rule or what you told this customer on the phone, unless that information is in front of it. When it does not know, it can still write something confident and wrong, such as a refund policy you never had. So the rule for a small business is simple: AI writes drafts, and a person sends.

Use the inbox you already have

Start with the tool built into your email before you buy anything else:

• Gmail has Help me write, which Google says is powered by Gemini. Open a reply, type what you want in the prompt bar and click Create. You can then ask for changes, or use Formalize, Friendly or Shorten. It can draw on your other emails and Drive files to personalise a draft, and a Sources button shows what it used.
• Outlook has Draft with Copilot. Choose the Copilot icon, then Draft, type a prompt and generate. You can change the length or tone, then keep the draft, edit it and send it yourself. Microsoft's help page is clear that the draft waits for you to send it.

Who can use these depends on the plan. Google includes its AI assistant in Gmail in its Workspace business plans, and offers Help me write on some personal accounts in the US. On Microsoft 365, Copilot in Outlook depends on your plan and licence, and Microsoft's advice if you cannot see it is to ask whoever manages your account.

Build a reply library in your own words

The biggest gain comes from a step that has nothing to do with AI: writing down your best answers once. A draft built from your own answer starts from the right facts, while one built from nothing has to guess them. To make the library:

• Read through the last month of emails you sent to customers.
• List the questions that came up more than twice.
• Write the best answer to each in your own words, with the facts it needs: the link to your price list, your cancellation rule, the parking, what to bring.
• Save each one where you can reach it while replying. Gmail calls these templates and lets you turn them on in the Advanced settings on a computer. A shared document works in any email tool.
• Give the library an owner, who updates it when a price, a rule or an opening time changes.

For a cleaning company, the list might be: what an end-of-tenancy clean covers, whether you bring products, keys and access, pets, moving a clean, what happens if something is broken, how payment works and the area you cover.

One saved answer, written the way the owner talks: "Moving your clean is no problem. Let us know at least a day before and we'll find a new time, usually the same week. If it's less than a day, we'll still try, but we may not be able to move it. Reply with the days that suit you and we'll confirm." The draft tool adapts that to each customer. It should never be left to invent the rule itself.

Ask for the draft the right way

Put your saved answer into the reply first, then ask the tool to adapt it, rather than asking it to answer from nothing. Tell it what to keep, what to avoid and how long to be:

• "Rewrite the text below as a reply to this email. Keep the cancellation rule word for word. Under 100 words, friendly, sign as Amy."
• "Answer her question about parking using only the information below. Do not mention prices."
• "Make this shorter and warmer. Do not promise a date."

The limits matter as much as the request. "Do not offer a discount", "do not promise a date" and "do not say sorry for anything except the delay" keep the draft inside what you would actually say.

A person approves every draft

Read every draft as if a new member of staff wrote it. Before you press send, check:

• Every fact against its source: dates, times, prices, names, addresses.
• Every promise. Did it offer a refund, a discount, a date or a call back you did not mean to give?
• That it answers the question the customer asked, not a similar one.
• That nothing from another customer's email has crept in.
• That it sounds like you, and is signed by the person who will deal with the reply.

If most drafts need rewriting, the fix is usually the library, not the tool: an answer is missing or out of date. Add it and the drafts improve.

Do not let AI send emails on its own from an inbox customers write to. A wrong price or a promised refund sent at 2am is yours to honour or to apologise for, and a person reading it first is the only check that catches it.

Emails never to draft with AI

Some emails need a person from the first word, because the cost of a wrong sentence is high or the reply needs a judgement only you can make:

• Complaints. The tone and what you concede matter, and a smooth draft can admit fault you do not accept or promise a fix you cannot give.
• Anything mentioning a solicitor, a court, a claim or a chargeback.
• Health details, such as symptoms, medicines or a reaction to a treatment.
• Refunds, credits and money disputes.
• Anything about a member of staff.
• Bad news for the customer, such as a cancelled job or a bereavement in the family.
• A question you have never answered before. Answer it yourself, then add it to the library.

These emails are often the ones where a quick, perfect-looking reply feels most tempting. Write them yourself, slowly, or phone.

Clinics, law firms and other sensitive inboxes

A dental or medical clinic's inbox holds health information, and health information has extra rules: HIPAA in the US and the GDPR in Europe. Before you switch on an AI feature in that inbox, ask whoever advises you on privacy whether your agreement with Google or Microsoft covers it, and which emails it may read. Many clinics keep AI drafting to the general booking inbox and out of anything clinical.

A law firm holds confidential client matters, and its professional rules on confidentiality and supervision apply to any tool it uses. Draft routine replies, such as confirming a meeting time, and keep anything that touches a matter's substance with the lawyer.

Three replies, drafted and checked

• A salon client asks to move Saturday's colour to the week after. The receptionist inserts the saved answer on moving bookings, asks for a short friendly reply offering next Saturday at 11 or 2, and checks both times in the diary before sending. Twenty seconds of drafting, one minute of checking.
• A customer asks a cleaning company whether a deep clean includes inside the fridge. The saved answer says it does, inside the oven costs extra. The draft says both are included. The owner catches it, fixes the line and adds "oven is extra" in bold to the saved answer so the next draft gets it right.
• A customer writes that the cleaner broke a vase and they want it paid for. Nobody drafts this one with AI. The owner rings the customer, then writes the follow-up email herself, saying what was agreed on the call.

Summaries before you reply

Drafting is one use. Reading is the other. Google describes its assistant in Gmail as helping you find, summarise and write emails, and Microsoft describes Copilot in Outlook as helping you catch up on email and draft responses. In a small business, the summary is often the bigger saving: a 20-message thread with a builder's client, read in ten seconds before you ring them back.

Treat a summary like a draft. It can drop the one line that matters, such as the date the client changed last week. Before you act on it, open the latest message and check the dates, the amounts and what was agreed.

Write the rules down for your team

If more than one person answers customer email, put the rules on one page, so everyone uses the tool the same way:

• Which emails may be drafted with AI, and which never are.
• That every draft is read and sent by a person, who signs it.
• Where the saved answers live, and who updates them.
• Which inboxes the AI feature is switched on for.
• What never goes into any AI tool your business has not approved: client files, card details, anything about health.

Go through it with each new member of staff on their first day with the inbox.

What decides the cost

Both Google and Microsoft price per user, per month. Google includes its AI assistant in Gmail in its Workspace business plans. Microsoft sells Copilot for business as an add-on to Microsoft 365, or inside plans that include it. What decides your bill:

• How many people need it. Buy it for the one or two who answer customers, not for everyone.
• Whether your current plan already includes it. Check before you upgrade.
• Annual or monthly billing, which changes the price per user.
• The time spent checking drafts, which is the real cost. If checking takes longer than writing, it is not worth it for that kind of email.

When the inbox's own tool is not enough

The tool in Gmail or Outlook drafts one reply at a time, when you open the email. That suits one or two people answering a handful of customer emails a day. A shared inbox with many enquiries needs more: each new email sorted by topic, a draft waiting in the right folder before anyone opens it, built only from your approved answers and your real booking information.

That is an AI assistant built for one job. Ours read only the inboxes named in the plan, draft from information you approve and leave every draft for a person to check before anything is sent. When the job is routing and chasing enquiries rather than writing replies, enquiry follow-up automation is the simpler tool. Software that acts on its own goes further still, and AI agents for small business covers what that can safely do today.

Check it is helping

Before you start, note how long a customer email waits for its first reply and roughly how long your team spends on email each day. A month later, look again, and look at the drafts:

• How many went out with light edits, and how many were rewritten.
• Which mistakes the checks caught, and which saved answer would have prevented each.
• Whether replies are faster, or only easier to write.

If nothing changed, switch it off. A tool that saves no time still carries the risk of the email nobody checked properly.

Mistakes to avoid

• Drafting from nothing instead of from your own saved answers.
• Sending without reading, because the draft looks finished.
• Letting it guess a price, a date or a policy.
• Using it on complaints and legal letters.
• Switching it on in a clinical or legal inbox without asking your privacy adviser.
• Buying it for every member of staff before trying it with one.
• A library nobody updates, so drafts repeat last year's prices.

If the emails that repeat are enquiries that could be answered before they are even sent, the auto-reply templates and a clearer website may save more time than any drafting tool.