Will AI emails sound like me? Tone, footers and customers noticing

AI emails sound like you when you give the tool three or four of your own emails, a short style guide and a fixed footer, and you read every draft before it goes. Customers rarely spot AI from the words. They spot it from the tone: too long, too formal, too keen. Fix those and most won't notice.

Can customers tell an email was written by AI?

Sometimes, and almost always for the same reasons. The email is three times longer than yours usually are. It opens with "I hope this email finds you well". It thanks them for "reaching out". It uses words a roofer from Wendover wouldn't use.

A customer who has had six texts from you saying "Morning, be with you about 8" will notice when the seventh message reads like a bank. They won't care that software helped. They will care if it sounds like you've stopped paying attention.

How do you make AI write like you?

Show it, don't describe it. Paste in three or four emails you've sent that you were happy with, and add a short style guide with the rules it keeps breaking. Put both in the tool's standing instructions, so you don't repeat yourself every time.

You are writing emails and messages for your name at business name, a trade firm in town.

HOW I WRITE
Short. Most of my emails are under 80 words.
I start with "Hi first name," and end with "Cheers, your name" or "Thanks, your name".
Plain words. I say "job", not "project". I say "price", not "investment".
One point per paragraph. No bullet points in emails to homeowners.
I give a day and a time window, never "in due course".

NEVER WRITE
"I hope this email finds you well", "reaching out", "please do not hesitate", "at your earliest convenience", "delighted", "thrilled", exclamation marks.

FACTS
Never make up a date, price, measurement or product. If you don't know, write CHECK and I'll fill it in.
All times are UK time.

FOOTER
Always add this footer exactly, and never change it:
footer text

EXAMPLES OF MY EMAILS
paste 3 or 4 real emails

The "write [CHECK]" rule matters most. It turns a made-up fact into a gap you'll see when you read the draft.

What does the difference look like?

Here's a quote follow-up as a general AI tool writes it with no guidance, then with the style guide above.

Without a style guide (92 words): "Dear Mrs Patel, I hope this email finds you well. I wanted to reach out regarding the quotation we recently provided for your roofing project. We are delighted to have had the opportunity to assess your requirements and believe our proposal offers excellent value. Please do not hesitate to contact me should you have any questions or require further clarification. We would be thrilled to work with you and look forward to hearing from you at your earliest convenience. Kind regards, The Team"

With the style guide (43 words): "Hi Sarah, following up on the price for the flat roof at the back, £1,490 + VAT. I've got a gap in the week of 16 November if that suits. Any questions, give me a ring on [number]. Cheers, Dan"

The second one sounds like a tradesperson. It also does more work: it names the job, the price and a start date.

What must your email footer say?

If you trade as a limited company, your emails are business correspondence, and the Trading Disclosures Regulations require your registered name on all of it. Business letters, order forms and websites must also show your registered number, registered office address and the part of the UK where the company is registered.

Sole traders don't have these company rules, but if you trade under a name that isn't your own, it's sensible to show your own name and an address too. Ask your accountant if you're unsure which applies.

What goes wrong when AI sends emails for you?

Small things that make you look careless. A Swindon heating and air conditioning firm with about six engineers hit two in their first weeks with an AI assistant: a footer rule that was forgotten on some emails, and times appearing in the wrong time zone. Both are the kind of slip you catch by writing the rule down once and checking drafts until it sticks.

Other common slips:

• Wrong facts. A date or price the AI assumed. The [CHECK] rule catches most of these.
• Over-promising. "We'll be there first thing tomorrow" when you won't.
• Replying to the wrong thread. Easy when you approve drafts quickly on a phone.
• Marketing by accident. A friendly "we also do driveways" in an appointment reminder can turn a service message into marketing. The ICO says service messages "can't contain anything promotional". Sole traders count as individuals for email marketing rules.

Don't let AI send emails to customers without you seeing them, at least until you've watched it for a month. One wrong price in writing can become the price you're held to.

Should you tell customers you use AI?

Whether or not you label an email as AI-assisted, you are responsible for what it says. If AI tools process customer details, your privacy notice should say who you share data with. The ICO says a privacy notice should explain why you need people's data, how long you'll keep it and who you'll share it with.

A sensible approach is to treat AI the way you'd treat an office manager drafting for you: the email goes out in your name, so you read it first. If a customer asks, be straight about it. For data questions, see is AI safe with your email and Xero data.

1. Collect four emails you're proud of.

   A quote, a follow-up, a "running late" and a "job done, here's the invoice".

2. Write your never-say list.

   Ten phrases that make you wince.

3. Fix your footer.

   Copy it from your current email signature and check it against the checklist above.

4. Load it all as standing instructions.

   In a project or custom instructions, so every draft uses it.

5. Review drafts for a month.

   Each time you edit one, add a rule so you don't have to make that edit again.

Your rates and pricing rules belong in the same setup: see teaching AI your rate card.

Common questions