A business email works when the reader knows what it is about after the first sentence and knows what to do after the last one. Everything in between is context and reasoning, in this order: subject line, core message, reasoning, next step with a date, sign-off. That carries the emails that come up in business every day, from an enquiry to a cancelled meeting, a price and an unpaid invoice. Whether you write these yourself or have them drafted comes down to one line: the more routine an email is, the more readily an AI role can draft it. The more delicate or personal it is, the more it belongs to you. Either way, the decision to send stays with you.
In my business the routine goes to Sonja, who writes the new-client email. She puts drafts in my inbox and never sends anything herself, and that is not a safeguard for beginners, it is how she is built. How I build my roles lives on the AI employees page, which tasks I hand off at all is in Which Tasks You Can Hand Off to AI.
The structure that carries business email
Five building blocks in this order:
- Subject line: the matter, not the topic. "Cancelling our meeting on 14 October" instead of "Meeting". The subject is the one part everyone reads, and it should carry the message, not its category.
- First sentence: the core message. Yes or no, the price, the new date, the bad news, complete and with no run-up.
- One or two sentences of reasoning. Long justifications don't read as more careful, they read as less certain.
- One next step with a date. "I'll come back to you on Monday with two proposed times" is a step, "I'll be in touch" is not.
- The sign-off. Closing line and signature, no summary of what was already said four lines above.
The test takes ten seconds: delete everything except the subject line and the first sentence. If the email still makes sense, the order is right.
The second rule is a starting rule: one email, one matter. Two different topics mean one of them goes unanswered, usually the more important one. Two follow-up questions about the same thing may travel together.
The structure does not carry by itself for a termination, a reply to a complaint, an apology for your own mistake, a message of condolence or a negotiation running over several rounds. There the situation decides the order and the length, and those emails are yours anyway.
Five situations and the six mistakes
The situation differs every time, the pattern doesn't. Only the core message changes:
Across all five, the same six mistakes:
- The explanation before the message. The most common one, and it comes from consideration: the reader works through the text with rising unease, sensing that something is coming without knowing what.
- The conditional. "I would suggest that we might perhaps take another look at this." "I suggest Thursday at 10" says the same thing and can be answered.
- More than one question. Three questions get one answer at best, often none.
- No next step. "Feel free to get in touch any time" is not a request, it is a goodbye.
- Apologising for your own email. "Sorry to bother you", "I just wanted to quickly". You had a reason to write.
- The closing summary. It extends the email by the part nobody reads.
There is one formatting mistake that costs more than it looks: the recipient field. Reply to a client email and leave everyone in copy, and you have sent an internal assessment outside the house. The second before hitting send belongs to the address line.
Three examples: the same content, good and bad
These are built examples, not copies of real emails. It is not the wording that transfers, it is the reason behind each line.
Example 1: cancelling a meeting
Here is what it looks like when consideration decides the order:
Subject: Our meeting
Dear Mr Kaiser,
I hope this finds you well. Things are rather busy over here at the
moment, and unfortunately the situation has become more difficult
this week. Against this background I would have to ask whether it
might possibly be an option to move our meeting.
Kind regards
Kevin Welter
And here it is with the message up front:
Subject: Cancelling Thursday 14 October
Hello Mr Kaiser,
I have to cancel our meeting this Thursday at 10. Two people on my
side are off sick this week.
As a replacement I can do Tuesday 19 October at 10, or Wednesday
20 October at 2pm. I'll hold both until Friday. Just tell me which
one works and I'll send the invite.
Best
Kevin
The difference isn't tone, it's order. Above, the cancellation sits in the third paragraph as a conditional question; below it is in the subject line, with two dates on hold: the reader has to write one word, not think.
Example 2: quoting a price
Here is the hard way:
Subject: Your enquiry
Dear Ms Dorn,
Thank you very much for your interest. We place great value on
quality and personal service.
The effort involved depends on many factors and is difficult to
quantify in general terms. In our experience, comparable projects
fall in the mid four-figure range. I would be happy to discuss this
on the phone.
Kind regards
Kevin Welter
And here it is with a number:
Subject: New website: 3,400 euros, live by the end of November
Hello Ms Dorn,
For what you described I'm at 3,400 euros plus VAT: five pages, a
contact form, your existing text and images carried over, finished by
the end of November.
Not included: new photography and ongoing maintenance after launch.
Maintenance starts at 49 euros a month.
If that's the right direction, I'll send the quote in writing. A
short yes is enough.
Best
Kevin
"Mid four-figure range" reads as cautious but forces the reader to guess, and guessing almost always lands at the lower edge. The second version names figure, scope and date in one sentence and says what is not included. How the quote that follows is built is in How to Write a Quote That Convinces.
Example 3: chasing an invoice
The first payment reminder is the most uncomfortable email on the list:
Subject: Quick question
Dear Mr Sandner,
Sorry to bother you, I really don't want to be pushy. I think it may
possibly be the case that last month's invoice is perhaps still open.
If so, I would be very grateful if you could take a look at it when
you get the chance.
Kind regards
Kevin Welter
And here it is when the matter stays a matter:
Subject: Invoice 2026-214 of 12 August still open
Hello Mr Sandner,
My invoice 2026-214 of 12 August for 1,190 euros hasn't come in yet.
It was due on 26 August.
It has most likely just got lost in the day-to-day, so I'm attaching
it again.
Can you transfer the amount by 2 October? If something about the
invoice is wrong, drop me a line.
Best
Kevin
Three things make the difference: invoice number and date in the subject line, so the accounts department can file it straight away, no assumption of bad faith but of the likely explanation, and a clear new date instead of "when you get the chance".
For chasing payment, a look at the law removes the uncertainty. Under section 286(1) of the German Civil Code (BGB), a debtor is in default when they fail to pay after a reminder from the creditor. Under section 286(2) no. 1 BGB, no reminder is needed where the time for performance is fixed by the calendar. What matters is that this time is validly fixed, for instance by an agreed payment term naming a specific date; a date you write on the invoice unilaterally does not have that effect automatically. Independently of that, section 286(3) BGB provides that the debtor of a monetary claim is in default at the latest if they do not pay within 30 days of the due date and receipt of an invoice, though against a consumer only if the invoice pointed this consequence out specifically. From default onwards interest is owed: under section 288(1) BGB five percentage points above the base rate, under section 288(2) BGB nine percentage points in transactions where no consumer is involved, plus a flat 40 euros under section 288(5) BGB where the debtor is not a consumer. That is the wording of the statute and not legal advice for your case; whether you actually claim these amounts is a business decision, and rarely the right move in email number one.
With or without AI: where the line runs
The question in the headline can be answered without a debate about principles, four criteria are enough:
That turns into a simple sorting:
The lower half has one thing in common, and it isn't linguistic: there the email itself is the decision. Delegating it doesn't hand off the wording, it hands off the judgement. And the recipient of bad news reads very carefully for whether someone took the trouble.
In the upper half, approval stays with you: a draft is a proposal, not a transaction, whether it comes from a role of your own or from an AI email tool. And the tone has to be yours. What it is made of is in Can AI Write Emails in My Voice?.
How this works in my business
The routine in my business goes to Sonja, who writes the new-client email. The typical case: my website colleague finishes a demo, Sonja drafts the email to the business, checks every fact against the source, name, address, demo link and price, and puts the text in my inbox as a draft. In a campaign of 15 new-client emails in July 2026, I had already sent eight myself; the remaining seven drafts were sitting in my inbox within about two minutes, with every demo link in them checked for reachability the same day. One oddity went back to my colleague: one template still had a placeholder where the sender's name belonged. I sent them myself.
Three limits are fixed, and they are the reason the sorting above works at all. She invents no message: she improves language, tone and form, not the content and not the price. She never guesses, she asks. And she does not send, "looks good" is not approval. The same split applies to following up afterwards, and the rhythm for that is in How to Follow Up on a Quote by Email, the other roles are in My AI Workforce. And because these emails carry other people's names, addresses and amounts: what belongs in a model is in AI and Privacy: What the AI Gets to See.
Common questions
How should I start a business email?
With the core message, not a pleasantry: the yes, the no, the price, the new date. "I hope you are well" carries no information and pushes the message to where it gets lost when the email is skimmed.
How long should a business email be?
As a rule of thumb, short enough to fit on a phone screen without scrolling, usually five to ten lines. How much that is depends on the device, the font size and the signature; the better yardstick is the number of matters. If the subject needs more room, it belongs in an attachment, and the email says what is in it.
Can I have an AI write my business emails?
Drafted, yes. There is no law that bans automated sending across the board; what matters is content, authority to act, data protection, marketing law and the check before sending, and the sender stays responsible. On top of that I keep a fixed house rule: routine emails as drafts, reviewed by me, sent by me. Delicate emails such as endings, complaint replies or terminations I write myself.
When can I chase an unpaid invoice?
As soon as the payment term has passed. Where a payment term naming a specific date has been validly agreed, default can set in without a reminder under section 286(2) no. 1 BGB; independently of that, the 30-day rule in section 286(3) BGB applies, against consumers only with the specific notice in the invoice. A friendly reminder with a new date is still the usual and usually more effective step. Not legal advice.
Where to go from here
Take the last ten emails from your Sent folder and check two things in each: is the core message in the first sentence, and is there a next step with a date? Where one is missing, rewrite only the first two lines, not the whole email. Then sort those same ten into two piles, routine and delicate. The routine pile is the list worth drafting.
If an email gets stuck between the piles, post that exact case in my community Claude Practitioners or bring it to one of the calls. Sonja comes with this structure as a finished package there, together with the other AI employees and the course.
