Never Write the Same Client Email Twice: How to Build AI Templates That Sound Like You

If you’re running a service business, there’s a good chance you write some version of the same email 5-10 times a week.

[elementor-template id="8327"]

The proposal intro. The “here’s your weekly update.” The onboarding welcome. The “just following up.” The “thanks for the referral.” You’ve written each of these dozens (maybe hundreds) of times.

You already know what they should say. You just have to write them again. And again. And again.

Here’s the thing: you can teach AI exactly how you write, and then have it draft these emails in seconds instead of minutes. Not in some generic robot voice. In your voice, with your tone, customized to each client. According to a 2026 survey by the U.S. Chamber of Commerce, 63% of small businesses using AI are already using it for marketing and communications, but most are getting generic outputs because they haven’t taken 10 minutes to teach the AI their style.

This post shows you exactly how to set that up. 10 minutes of setup, and you’ll never start a client email from scratch again.

What Does an AI Email Template System Look Like?

A system where you can say:

“Write a proposal email for Sarah at Bright Homes. She needs a website redesign, budget is around $5K, timeline is 6 weeks.”

And AI comes back with a full, polished email that sounds like you wrote it, because it learned from emails you actually sent.

How Do You Teach AI Your Writing Style? (ChatGPT + Custom Instructions)

I’m using ChatGPT for this one because its Custom Instructions feature is purpose-built for this kind of thing. It lets you tell ChatGPT about your business and your style once, and then every conversation from that point forward already has that context.

(I’ll show you how to do the same thing in Claude using Projects at the bottom.)

Step 1: Pick Your 3 Most-Repeated Email Types

Don’t overthink this. Which emails do you write over and over? For most service businesses, it’s some combination of:

• Proposals / quotes: “Here’s what we’d do, here’s what it costs”
• Status updates: “Here’s what happened this week on your project”
• Onboarding / welcome emails: “Great to have you on board, here’s what happens next”
• Follow-ups: “Checking in on [thing we discussed]”
• Referral thank-yous: “Thanks for sending [name] my way”

Pick the 3 that eat the most of your time. Those are your starting templates.

Step 2: Find One Good Example of Each

Go into your Sent folder and find one email for each type that you were happy with. One where you thought, “Yeah, that’s how I want to come across.”

Don’t pick the one you rushed. Pick the one that felt right.

Copy the full text of each one.

Step 3: Feed Them to ChatGPT

Open ChatGPT and paste this prompt (with your actual emails swapped in):

I’m going to show you 3 emails I’ve sent to clients. I want you to learn my writing style from these: my tone, sentence length, how I open and close emails, how formal or casual I am, and any patterns you notice.

After you’ve analyzed them, confirm back to me what you’ve learned about my style. Then, whenever I ask you to write a [proposal / status update / onboarding email / etc.], use this style. Ask me for the specific details you need before drafting.

Email 1 (Proposal):
[Paste your actual proposal email here]

Email 2 (Status Update):
[Paste your actual status update email here]

Email 3 (Onboarding):
[Paste your actual onboarding email here]

ChatGPT will come back with something like:

“Based on your emails, here’s what I’ve noticed about your style: You open with a personal touch (first name, brief reference to your last conversation). Your tone is warm but professional, conversational without being sloppy. You use short paragraphs, typically 1-3 sentences. You almost always end with a clear next step. You avoid jargon and corporate-speak…”

Read through its analysis. If it nailed it, great. If it missed something (“I’m actually a bit more casual than that” or “I always sign off with my first name only”), tell it. It’ll adjust.

Step 4: Set Up Custom Instructions (One-Time, 2 Minutes)

This is the step that makes it stick. Custom Instructions tell ChatGPT about you and your business in every conversation, so you don’t have to re-explain yourself each time.

1. In ChatGPT, click your profile icon (bottom-left on desktop)
2. Click Customize ChatGPT (or Custom Instructions)
3. You’ll see two fields. Fill them in like this:

“What would you like ChatGPT to know about you?”

I run [Your Business Name], a [what you do] based in [city]. My clients are [brief description, e.g., “small business owners, mostly local service companies”]. When I write emails, I’m warm, direct, and concise. I avoid corporate jargon. I always include a clear next step. My sign-off is [however you sign off, e.g., “Best, Dallin” or “Talk soon, Dallin”].

“How would you like ChatGPT to respond?”

When I ask you to draft an email, write it in my voice based on the style examples I’ve provided. Keep it under 150 words unless I say otherwise. Use short paragraphs. Don’t start emails with “I hope this email finds you well” or anything generic like that. Always include a specific next step at the end. Ask me for any details you need before drafting.

Save it. Done. Now every time you open ChatGPT, it already knows who you are and how you write.

Step 5: Test It

Now try it. Open a new ChatGPT conversation and type:

Write a proposal email for Sarah at Bright Homes. She needs a new website, mainly a redesign of her existing site. Budget is around $5K, timeline is 6 weeks, and we’d start with a discovery call next Tuesday.

You should get back a draft that sounds like you wrote it. Not like a robot. Not like a marketing textbook. Like you, on a good day, when you have time to write a thoughtful email.

Review it. Tweak if needed. Copy, paste into Gmail, send.

Time spent: maybe 2 minutes. Time it used to take: 15-20 minutes.

What Does the Day-to-Day Workflow Look Like?

Once the setup is done, here’s what your workflow looks like:

Need a proposal?

“Write a proposal email for [name] at [company]. They need [service]. Budget is [X], timeline is [Y].”

Need a status update?

“Write a weekly update for [client name]. This week we [did X, Y, Z]. Next week we’re [doing A and B]. They need to [send us their logo / approve the mockup / etc.].”

Need an onboarding email?

“Write a welcome email for [new client name]. We’re kicking off [project type] on [date]. First step is [whatever].”

Each one takes 30-60 seconds to prompt and another minute to review. That’s it.

How Much Time Does This Save?

Let’s say you send 10 client emails a week that fall into these categories, and each one used to take 10-15 minutes to write from scratch.

• Before: 10 emails × 12 minutes = 2 hours/week
• After: 10 emails × 2 minutes = 20 minutes/week
• Weekly savings: ~1.5 hours
• Monthly savings: 6+ hours

That’s almost a full workday back every month. And the emails are often better than what you’d write when you’re rushing between meetings, because the AI is working from your best examples, not your most distracted ones.

Can You Do This with Claude Instead of ChatGPT?

If you prefer Claude over ChatGPT, you can do the same thing using Projects.

1. Open Claude (web or desktop)
2. Create a new Project (e.g., “Client Email Templates”)
3. In the Project instructions, paste the same style analysis prompt from Step 3, your example emails plus the instruction to learn your voice
4. Add your Custom Instructions text as the project description

Now, every conversation inside that project has your voice and business context built in. Same result, slightly different setup.

The advantage of Claude here: if you also connected it to Gmail (from our last post), you can do everything in one place: read emails, draft replies in your voice, and send, all without leaving Claude Desktop.

Pro Tips

Add more templates over time. Started with 3? Once those are working, add your referral thank-you email, your “checking in after a quiet period” email, your “meeting follow-up” email. The more examples AI has of your writing, the better it gets.

Save your best prompts. Keep a simple note (even in your phone) with your most-used prompts. “Write a proposal for…” “Write a status update for…” Copy-paste the framework, fill in the blanks.

Let it ask you questions. Notice the prompt says “ask me for the specific details you need before drafting.” This is intentional. It’s better to have the AI ask “What’s the budget?” and “When do they want to start?” than to have it guess and get it wrong. A 15-second Q&A beats a bad first draft every time.

Frequently Asked Questions

Will the AI just sound generic and corporate?

Not if you feed it your actual emails. That’s the whole point of Steps 2-3. The AI mirrors the style, tone, and structure of the examples you give it. If your emails are warm and casual, the drafts will be warm and casual. If you’re more buttoned-up, the drafts will match. The key is giving it your best examples, not templates you downloaded from somewhere.

What if I have different tones for different clients?

You can handle this two ways. In ChatGPT, you can add a note to your prompt: “This client is more formal, keep the tone professional.” Or in Claude, you can create separate Projects for different client types with different style instructions. Most people find that one set of instructions covers 80% of their emails.

Does this work for long, complex proposals or just short emails?

Both. For short emails (meeting follow-ups, status updates), you’ll barely need to edit the output. For longer proposals, think of AI as your first-draft machine: it handles structure, tone, and boilerplate, and you add the specifics and strategic thinking. A 2026 study found that businesses using AI for proposals saw 87% improved win rates, largely because the proposals were more consistent and polished.

How is this different from using email templates in Gmail?

Gmail templates are static: they’re the exact same text every time, and you have to manually customize each one. AI templates are dynamic: you give it the context (“new client, website project, $5K budget”) and it generates a personalized email every time. Same voice, different content. It’s the difference between a form letter and a personal note.

Try It Right Now

1. Go to your Sent folder and find 3 good client emails
2. Open ChatGPT (or Claude)
3. Paste the prompt from Step 3 with your real emails
4. Set up Custom Instructions (Step 4)
5. Ask it to write a proposal for a real or hypothetical client
6. See how close it gets

First time usually takes about 10 minutes. Every email after that takes about 2.

Next time: how to turn your inbox into a to-do list, automatically. No more digging through emails to figure out what you’re supposed to be doing today.

– Dallin