How to write professional emails in English: six parts, ten templates, and the ten mistakes non-native writers make most

What is the format of a professional email in English?

A professional email in English has six parts, and the whole thing fits on one phone screen: a subject line of three or four words, a greeting with the person's name, one sentence that says why you are writing, the details in two or three short sentences, one ask with a date, and a sign-off. Here is the six-part shape filled in, 51 words, for a customer who has not paid:

Subject: Invoice 2231 payment date

Dear Ms. Alvarez,

I am writing about invoice 2231, which was due on 12 September.

Our records show it is still open. The amount is 4,800 euros, and a copy is attached.

Could you confirm a payment date by Friday, 3 October?

Best regards, Lena Fischer

Every line does one job. The subject names the thing and the decision. The purpose sentence starts with "I am writing about" or "Thanks for", never with weather or health. The ask is a single question with a date in it, so the reader knows what to do and when. Nothing in the email would confuse a twelve year old, and that is the point.

Those replies come from Boomerang's 2016 analysis of more than 40 million emails its customers asked it to track for a reply. Its own words: "Emails written at a 3rd grade reading level were optimal." They got 36% more replies than college-level writing and 17% more than high-school level. The same dataset found that subject lines of 3 to 4 words received the most responses and that emails asking one to three questions were 50% more likely to get a reply than emails asking none. Every long word you are unsure of costs you twice, once in your time and once in the reply rate.

One more reason to keep it short: Microsoft's telemetry for its June 2025 Work Trend Index found the average worker receives 117 emails a day, "most of them skimmed in under 60 seconds". Your email competes with 116 others for one minute of attention.

The page-one guides for this query agree on the structure and stop there. The eight article pages ranking on 27 September 2026 (Talaera, engVid, Instructional Solutions, Speak Confident English, EF English Live, Break Into English, English Path and RewritePal) carry 12 complete email templates between them, a median of one each; EF and English Path have none, and none of the eight names a mistake that comes from a specific first language. The ten templates and the ten fixes below are the parts they leave out.

If English is your second language, your reader almost never notices the accent in writing that they would hear in speech. EF's 2025 English Proficiency Index scored 2.2 million adults in 123 countries against a global average of 488; Vietnam scored 500 (rank 64), India 484 (74), Brazil 482 (75), Japan 446 (96), Mexico 440 (103) and Saudi Arabia 404 (115). EF's finding for the same edition: "In over half of the countries measured, speaking is the weakest English skill." Writing gives you the thirty seconds that speaking never does, and the six parts above use them.

How formal should a professional email in English be?

A professional email in English sits one step more polite than speech and two steps below a legal letter: "Could you send it by Friday?" rather than "Can you send it" and never "I would be most grateful if you could kindly send it". Non-native writers miss on the formal side far more often than the casual side, because school English teaches the letter register and work email dropped it years ago. The table is the same six parts at three settings, for a first email to a business contact in the US or UK as of September 2026.

Two rules set the level. On first contact, write one step more formal than you think the reader expects: "Dear Ms. Alvarez" costs nothing, and a German, Japanese or Korean reader will read "Hi" from a stranger as careless. After the first reply, match the register of the last email you received. If they signed "Best, Tom", you sign "Best, Lena". The middle column is what an American or British colleague writes to another colleague, and it is safe in every English-speaking office.

Formal and polite are different things. "Kindly revert at the earliest" is formal and reads as an order; "Could you reply by Wednesday?" is plain and reads as polite. Politeness in English lives in the question form and the date, and how to soften a message shows the five moves that add warmth without removing the ask.

How should I sign off a professional email in English?

Sign off with "Best regards," or "Kind regards," followed by your full name; those two lines cover almost every work email in every English-speaking country. "Best regards" is the American default and "Kind regards" the British one, and either is understood everywhere.

The others have narrower uses. "Sincerely," is the formal American sign-off for letters, cover letters and first emails to someone senior. "Yours sincerely," and "Yours faithfully," belong to British letters: sincerely when you used the person's name, faithfully when you wrote "Dear Sir or Madam", and both look stiff in a reply thread. "Thanks," works when the reader did something for you, and "Best," works once you are on first-name terms. "Cheers," is fine in the UK and Australia between people who know each other and reads as odd in the US. Skip "Thanks in advance", which tells the reader you have already decided they will say yes, and skip "Regards" on its own, which is the coldest of the set.

Under the sign-off, put your full name, then your job title and company on the next line, and a phone number if you want calls. Purdue University's Online Writing Lab, which teaches this to students in its email etiquette page, adds the rule non-native writers most often break in the other direction: "Use standard spelling, punctuation, and capitalization." A sign-off in capitals, or a name in lower case, is read before the message is.

The ten mistakes non-native writers make most, and the fix for each

The ten mistakes below are either direct translations from a first language or phrases that are standard in one regional English and read as odd or too strong outside it. Three of them ("please revert", "do the needful", "I have a doubt") are correct Indian English and only need changing for a reader in North America, Europe or Australia. None of them is a spelling error, which is why a spellchecker leaves all ten in place.

Two of those deserve their dictionary entries. Wiktionary labels the reply sense of revert as "(originally India, now global)", which is exactly the problem: global among people who learned English in India and Singapore, unknown to a reader in Ohio, who will think you are asking them to undo something. And information is listed as usually uncountable, so "some information" and "two pieces of information" are right and "two informations" is the single most reliable sign of a French, German or Spanish first language in an English email.

The fix for all ten is the same habit: after you draft, read the email once as the recipient, someone who does not speak your language and has never met you. Anything you would not say out loud to a colleague at the coffee machine comes out. The AI prompt in the last section does this pass for you, and it catches these ten because they are patterns, not typos.

Ten professional email templates under 60 words

Each template below follows the six parts, runs under 60 words, and needs only the bracketed words changed. The subject lines are three or four words, which is the length Boomerang found got the most replies. Send them as they are; the plainness is deliberate.

1. Request:

Subject: Signed NDA by Friday?

Hi Marta,

I am writing about the NDA we discussed on Tuesday. The signed copy is the last document we need before the kickoff on 6 October. Could you send it by Friday, 3 October?

Best regards, [Name]

2. Follow up when there is no reply:

Subject: Following up: proposal

Hi Daniel,

I sent the proposal on 22 September and have not heard back, which is fine if you are busy. Is there anything you need from me to decide? If a call is easier, I am free Thursday afternoon.

Best regards, [Name]

3. Polite decline:

Subject: Speaking slot on 14 October

Dear Ms. Okafor,

Thank you for the invitation to speak on 14 October. I cannot take it, because I will be travelling that week. If a later date opens, I would be glad to hear about it.

Kind regards, [Name]

4. Apology for a mistake:

Subject: Wrong figures in Monday's report

Hi Tom,

The Q3 figures in Monday's report were wrong; the correct total is 48,200, not 42,800. The corrected version is attached. I am sorry for the confusion, and I have added a totals check so it does not happen again.

Best regards, [Name]

5. Asking for more time:

Subject: Report deadline: Wednesday?

Hi Sarah,

I am writing about the report due Monday. The supplier data arrived only this morning, so I need two more days to check it. Could I send it on Wednesday, 8 October, by noon?

Best regards, [Name]

6. Meeting request:

Subject: 30 minutes on pricing?

Hi Priya,

Could we take 30 minutes next week to agree the pricing for the March launch? I am free Tuesday 10:00 to 12:00 and Thursday after 14:00, your time. If neither works, please suggest a slot.

Best regards, [Name]

7. Rescheduling:

Subject: Moving Thursday's call

Hi Ahmed,

I need to move our call on Thursday at 15:00, because a client meeting was booked over it. Could we do Friday at the same time, or Monday at 11:00? Sorry for the change.

Best regards, [Name]

8. Confirming what was agreed:

Subject: Summary of today's call

Hi Elena,

Thanks for the call today. To confirm: you will send the revised quote by Wednesday, we will reply with a decision by Friday, and delivery stays at 20 November. Please tell me if I have anything wrong.

Best regards, [Name]

9. Thank you after help:

Subject: Thank you for yesterday

Hi James,

Thank you for walking me through the export process yesterday. The batch went out this morning without errors. If you ever need a hand on the reporting side, ask.

Best regards, [Name]

10. Introducing yourself:

Subject: New account contact at [Company]

Dear Mr. Silva,

I am [Name], and from 1 October I am your account contact at [Company], taking over from Ana. Nothing changes on your side. My number is below, and I will call next week to introduce myself properly.

Kind regards, [Name]

Template 3 is the short version of a whole family; how to politely decline an email has sixteen more, each under 50 words. What every template here shares is one ask, one date and no adjectives, which is also what makes them safe to send in a language you are still learning: there is nothing in them to get wrong.

Which AI prompt rewrites your draft without changing your meaning?

The prompt that works tells the model what it may not touch before it says what to fix: keep every fact, name, number, date and request, add nothing, and only then correct grammar, articles, prepositions and register. A model given no keep-my-meaning rule tends to add an opening line and a closing compliment on top of the grammar fixes, and the change list at the end of the prompt is how you catch it. Paste this with your draft under it.

```text

Rewrite the email below for a work reader in [country]. Keep every fact, name, number, date and request exactly as written. Do not add sentences, compliments or explanations, and do not change what I am asking for. Fix grammar, articles, prepositions, word choice and register. Use plain words, sentences under 20 words, and the tone of a polite colleague, not a lawyer. Keep it under [60] words. After the rewrite, list each change you made in one line each, so I can learn from it.

My draft:

[paste]

```

The change list at the end is the part that makes you better next month. When the model writes "changed 'since three days' to 'for three days'" ten times, you stop writing it. Also, read the list before you read the rewrite: if a line says "added a friendly opening", the model broke the first rule, and you delete that sentence.

Then run the tone check in a second model, one that has not seen your instructions and so reads the email the way the recipient will. Paste the rewrite and ask:

```text

You are the recipient of this email: a [role] in [country] who does not know me. Answer in three lines. How formal does it sound, 1 to 5? Does any sentence sound translated, stiff or rude? Is the request and its deadline clear? Then compare it with my original below and list anything whose meaning changed.

Rewrite:

[paste]

My original:

[paste]

```

A second model catches what the first cannot, because the model that rewrote your draft is grading its own work against instructions it was given, while the second is grading the email against nothing but the reader. On Whizi that is two columns of one screen, GPT for the rewrite and Claude for the check; the compare view that puts them side by side starts on Pro, though, on Starter the check runs on Claude Haiku in the same thread, and Gmail's Help me write beats any chat app on convenience because it lives inside the inbox. AI for email writing covers which model drafts best when you start from nothing instead of from your own draft.

The decision rule, whichever tools you use: send the version a twelve year old could read that still contains your date. If the rewrite lost the date, the model improved your English and ruined your email.