AI email writer: how to write professional emails, with five examples

By Infinithink Studio · October 27, 2026

An AI email writer earns its place on the emails you keep putting off. The supplier who still hasn't sent a quote, the client who went quiet after a proposal, the invoice that is two weeks late, the request you need to turn down without burning a bridge. You know what you want to say. Getting the wording right is what takes twenty minutes.

This guide shows how to brief an AI so the draft comes back usable, gives you five complete work emails to adapt, and ends with the checks to run before you press send. The examples are illustrative, with invented names and figures.

What an AI email writer can and cannot do

A good AI email writer is quick at structure and tone. It puts the purpose in the first sentence, splits the points into short paragraphs, picks a greeting that fits the relationship and ends with a clear request, in the language you choose.

What it cannot do is know your facts. It does not know the invoice number, the new delivery date or the reason you are declining. Leave those out and a careless tool fills the gap with something plausible and wrong, while a careful one leaves a placeholder. Either way, the email is only as good as the brief.

How to give the AI the right context

A useful brief covers five things. It is quick to write and usually saves a round or two of edits.

• Who the reader is. Name, role and your relationship, such as new client or long-time supplier. This sets the formality.
• Why you are writing. One sentence. If you can't write it, the email isn't ready.
• The facts. Dates, amounts, order or invoice numbers, attachments, exactly as they should appear.
• The one thing you want. A reply by Wednesday, a yes or no, a 15-minute call.
• What to avoid. Anything you can't promise, or a topic to leave out.

Compare two briefs. "Write a follow-up to a client about a proposal" gives the AI nothing. "Follow-up to Daniel Price, operations manager at a logistics firm. Sent a proposal for warehouse signage on October 9, no reply. Want a yes, a no or a short call this week. Mention we have an installation slot in late November" gives it everything.

Five professional emails, written in full

Each example shows the brief, the finished email and why it works. Square brackets mark details you would replace.

1. A request to a supplier

Brief. To Sara Lindqvist, account manager at our packaging supplier. Quote for 2,000 printed shipping boxes, 12 × 8 × 6 inches, two-color logo, delivery by December 1. Quote needed by Wednesday.

Subject: Quote for 2,000 printed shipping boxes, delivery by Dec 1

Hi Sara,

I'm writing to ask for a quote for 2,000 printed shipping boxes for our holiday orders.

The boxes would be 12 × 8 × 6 inches, with our logo printed in two colors on the lid, delivered to our warehouse by December 1.

Could you send the quote by Wednesday, including unit price, setup costs and lead time? If a different board or print option would bring the price down, I'd be glad to hear about it.

Thanks,

[your name], [company]

Why it works. The specs are complete, so the supplier can price the job without a second email.

2. A follow-up after no reply

Brief. The Daniel Price brief above.

Subject: Your warehouse signage proposal

Hello Daniel,

I'm following up on the proposal for warehouse signage I sent on October 9.

One update that may help with planning: we have an installation slot open in the second half of November.

Would a short call this week be useful? If it's easier, a simple yes or no on the proposal works too.

Best regards,

[your name]

Why it works. It names the previous contact in the first line, adds one new fact and asks for the smallest possible step. No "just checking in", no "as per my last email".

3. An apology to a customer

Brief. To Mark Ellison, customer. Order shipped five days late because an item was mislabeled in our warehouse. Ships today with free express delivery, tracking link this afternoon. Labeling fixed.

Subject: Your order is on its way, and an apology

Dear Mark,

I'm sorry your order is five days late. One of the items was mislabeled in our warehouse, and that held up the whole shipment. The mistake was ours.

Your order ships today with express delivery at no charge, and you'll receive the tracking link this afternoon. We have also corrected the labeling so this doesn't happen again.

If anything arrives damaged or incomplete, reply to this email and I'll take care of it personally.

Best regards,

[your name], Customer Support, [company]

Why it works. The apology comes first, the cause is plain and the remedy is concrete. There is no "we apologize for any inconvenience", a phrase that shrinks a real problem.

4. A polite payment reminder

Brief. To Priya Nair, accounts contact at a client. Invoice #1042, $2,400, September design work, due October 15, unpaid. Ask for payment or an expected date, ideally by October 30.

Subject: Invoice #1042, due October 15

Hi Priya,

I'm writing about invoice #1042 for $2,400, covering the September design work. It was due on October 15, and I haven't seen the payment come through yet.

If it has already been sent, please ignore this note, although a remittance confirmation would help. If not, could you let me know when we can expect it, ideally by October 30? I've attached the invoice again.

Thanks for your help,

[your name]

Why it works. Every reference needed to find the invoice is in the first paragraph, the tone assumes good faith, and there is a date. A second reminder can be firmer, still without threats.

5. Saying no

Brief. To Tom Becker at a partner agency, good relationship. He asked us to take a rush website project starting next week. We can't, the team is booked until mid-December. Offer January or suggest another studio.

Subject: Re: Rush website project

Hi Tom,

Thanks for thinking of us for the website project. I wish the timing were different, but we have to pass on this one. Our team is booked until mid-December, and a rush start next week would mean doing a poor job for you.

If the launch can move to January, we'd be glad to take it on and can hold a slot now. If it can't wait, [studio name] does solid work on short timelines.

Either way, keep us in mind for the next one.

Best,

[your name]

Why it works. The no arrives in the second sentence, with a real reason, and two alternatives mean the reader still leaves with something.

What to check before you send

1. Every placeholder. Search for square brackets. A forgotten [date] is the clearest sign an email was generated and not read.
2. Every fact. Names spelled right, numbers matching the invoice, dates matching the calendar, day of the week included.
3. Every promise. If the draft offers a refund, a call or a deadline, make sure you can deliver it.
4. The tone for this reader. "Hi" or "Dear", first name or last name. Match how they write to you.
5. Recipients and attachments. The right people in To and Cc, the attachment actually attached.
6. The phone test. If the request isn't visible without scrolling, move it up.

Mistakes that make AI emails easy to spot

The most common is sending the first draft as it is. Unedited drafts tend to open with a pleasantry, restate the context and close with "Please don't hesitate to reach out." Cut any line that says nothing.

The second is a vague brief. Ask for "something professional" and you get an email that is professional about nothing. The third is length. Most work emails need fewer than 200 words, and a longer draft usually means the brief mixed two emails. The last is a voice that isn't yours. If you always write "Hi" and "Thanks", a sudden "Dear" and "Kind regards" will stand out to people who know you.

Writing these emails with Infinithink

The Email Generator is built around the brief described above. It has two fields. In Subject or topic a working subject is enough. In What the email should say you write who it is for, why you are writing, the key points, any dates or figures and what the reader should do. You choose the language and tone of voice, and formality follows the recipient you describe.

It returns a complete email with a subject line of up to 60 characters, the purpose in the first sentence, short paragraphs, one clear request and a [your name] placeholder, usually 80 to 200 words. It is built not to fill a gap with an invented fact, so a missing price becomes [price]. It does not send email or connect to your inbox. You copy the version you like into your email client.

Three related tools fit some of the formats above more closely. Follow-up Email gives you three subject lines and a body of about 60 to 130 words that recalls the last contact. Apology Email works from the recipient's name and what happened, ideally with cause and remedy. Email Reply is built to answer every question in an email you received, in the order it was asked. For an email you wrote yourself, the Proofreading tool corrects it and explains each change.

All of these work on the Free plan, which is free and needs no credit card. Each email you generate uses credits, and so does each new version. On paid plans you can save company details in Brand Voice so you don't repeat them in every brief, and the pricing page shows which plans include it.

Start free with the Free plan. No credit card and no time limit, and the writing tools are ready to use right away. Create your free account

Frequently asked questions

Can AI write professional emails?

Yes, when you give it the facts. An AI email writer handles structure, tone and wording well. Names, dates, amounts and promises have to come from you, and every draft needs a read before it goes out.

Is it okay to send an email written with AI?

For everyday work email, yes, as long as you have checked it and stand behind every word. If your company has rules on AI tools, follow them, and leave confidential details out of the brief when they aren't needed.

How do I make an AI email sound like me?

Tell the tool how formal you are with this reader, then use your usual greeting and sign-off. Saving your company details and tone once, for example in Brand Voice, keeps later drafts consistent.

How long should a professional email be?

As short as the request allows. Most work emails fit in 80 to 200 words. If you need more, it may really be two emails, or the detail may belong in an attachment.