Email Etiquette: 20 Rules Worth Keeping and a Few to Drop

Email etiquette is the set of shared habits that make work email easy to read, answer and trust. The rules worth keeping protect the reader’s time, attention and privacy; the ones worth dropping mostly signal a formality that changes from one country or company to the next. Several rules below also close a gap that researchers have measured: in a 2021 series of experiments by Laura Giurge of London Business School and Vanessa Bohns of Cornell University, readers of a non-urgent evening or weekend email assumed the sender wanted a faster reply than the sender did.¹

The 20 rules below are grouped by the stage where each one applies:

1. Before you send
2. While you write
3. When you reply
4. Copying people in
5. Sign-off and signature
6. Timing and after hours

20 email etiquette rules, from first draft to after hours

The rules follow an email from first draft to the moment it lands, often in someone’s evening, each with its reason in a line. They build on the core communication skills, above all checking what landed with the other person, and on the structure in the guide to writing a professional email, which they don’t repeat. A few rest on research and carry a citation; the rest are common workplace practice, kept because the reason holds up.

1. Before you send

1. Decide whether it should be an email at all. A question that needs several rounds of back-and-forth, or news that will upset someone, usually goes better in a call.
2. Add the recipients last. With an empty To line, a half-finished draft cannot go out by accident.
3. Check every name that autocomplete fills in. Its first suggestion is often a different person with the same first name.
4. Turn on a send delay. Gmail, for example, can hold a sent message for 5 to 30 seconds, during which you can still cancel it.²

2. While you write

5. Make the subject line say what you need. It is the first thing a reader triaging the inbox sees; the guide to email subject lines for work has before-and-after examples.
6. Keep to one topic per email. Separate topics get answered, filed and forwarded separately anyway.
7. Write as if the email will be forwarded. You will not choose the next reader.
8. Reread any line that could be taken two ways, in the voice of a tired reader. Sarcasm and humor are hard to carry in text, and writers tend to overrate how well theirs comes across.³

3. When you reply

9. Acknowledge a request you cannot answer yet. “Got it, you’ll have it by Friday” ends the sender’s guessing.
10. Answer every question in the email, in the order asked. A reply that skips the second question starts another round.
11. Start a new email when the topic changes. An old thread buries a new decision under a subject line that no longer fits.
12. Move a heated thread to a call. A 2023 systematic reviewsystematic review: A review that fixes its question and its rules for including studies in advance, then searches out every study that fits and weighs them together. Some systematic reviews pool the results into a meta-analysis; others describe what the studies found without combining the numbers.Full entry in the glossary of 62 work-email papers found that being civil and considerate in email exchanges was one of four habits that consistently went with better wellbeing and work performance.⁴

4. Copying people in

13. Put the people who must act in To, and those who only need to know in CC. Google’s Gmail Help says CC is often used for recipients who don’t need to take any action.²
14. Don’t copy someone’s manager by reflex. In a 2019 paper by Tessa Haesevoets, David De Cremer and colleagues, employees felt least trusted when their supervisor was always copied in, and in a field survey that loss of trust went with lower psychological safetypsychological safety: A shared belief within a team that it is safe to take interpersonal risks, such as asking questions, admitting mistakes or raising concerns, without being punished or embarrassed. It is about candor, not about everyone being nice.Full entry in the glossary.⁵
15. Use BCC to keep a group’s addresses private, as in a mailing to people who don’t know one another. BCC recipients can’t see each other, and they don’t see later replies to all.²
16. Reply all only when everyone on the thread needs your answer. Everyone else gets one more email to open and close.

Reply all is the right button when your answer changes what other people on the thread will do: a decision, a correction, a new deadline. A “thanks” or “same here” belongs with the sender alone. In a large company the habit can jam the mail system: in 2020 Microsoft added a feature to Exchange Online that, in its first settings, blocked further reply-alls for several hours once a thread to more than 5,000 recipients drew a burst of them.⁶

1. To: the people who have to act or answer
2. CC: people who only need to know; they can see who else is on the To and CC lines
3. BCC: recipients whose addresses stay hidden from one another, as on a mailing to a group

5. Sign-off and signature

17. End with the next step, then a short sign-off. “I’ll send the draft on Thursday. Thanks, Ana” tells the reader what happens next and who said it.
18. Keep the signature to your name, role and one way to reach you. If your hours differ from your colleagues’, add a line saying you don’t expect replies outside their working hours, a footer the authors of the 2021 reply-speed research suggest.¹

6. Timing and after hours

19. Schedule an email you write late so it arrives in the recipient’s working hours. Gmail’s Schedule send, for example, sends at the time you pick in the time zone you schedule it in, so check that zone when the reader is abroad.⁷
20. Say how urgent the email is. “No rush, next week is fine” costs five words, and in the research below a note like it changed what readers assumed.

Why email etiquette needs rules at all

Email strips out the voice and expressions that tell a listener how a sentence was meant, so most of the rules above do repair work: they spare the reader effort or remove guesswork the writer cannot see. Writers are poor judges of that guesswork, as Justin Kruger, Nicholas Epley and two colleagues found across five experiments in 2005: people tended to overrate how well they could communicate over email. The authors traced the overconfidence to egocentrism: writers “hear” the sarcasm or the joke in their own words and have trouble reading the bare words as a stranger would.³

A team lead who writes “Interesting choice on the slides” may mean it as praise. A new colleague reading it alone late in the afternoon can take it as a rebuke, and nothing in the text tells them which. Rereading a line as that colleague would (rule 8) takes a few seconds, and it is the one check the writer can make alone.

Is it rude to not reply to an email?

Not replying is rude when an email asks you something directly and nothing tells the sender you saw it; an FYI, a newsletter or a group announcement can go unanswered. Speed is where readers tend to misjudge, and the Giurge and Bohns experiments suggest senders of non-urgent email are more patient than their readers assume.

The study

Moderate evidence

Senders were more patient than their readers guessed

Across eight preregisteredpreregistration: Filing a study's hypotheses and analysis plan publicly before the data are collected or examined. It stops a planned test from being rewritten once the results are in, so a reader can tell a real confirmation from a hunt through the data.Full entry in the glossary experiments with 4,004 participants, mostly US adults recruited online (in four studies, only full-time employees) plus a sample of public-sector employees in Spain, people in the receiver’s role expected the sender of a non-urgent work email sent outside working hours to want a faster reply than people in the sender’s role said they wanted. The gap went with more stress and lower wellbeing. In the final study, a one-line note from the sender saying it was not urgent brought receivers’ expectations closer to senders’.¹

The studies used recalled or imagined emails and people’s own ratings, not real inboxes, and the gap was clearest for evenings and weekends, though some of the studies found it within working hours too.¹ Both sides can act on this cheaply. As a reader, a one-line acknowledgment within your team’s usual turnaround covers anything that asks something of you, and the full answer can follow. As a sender, say when you need the answer, or that you don’t.

Myth

The fastest reply is always the most polite one.

Fact

In 2021 experiments, senders of non-urgent after-hours email expected slower replies than their readers assumed. A clear acknowledgment does the polite work.

An acknowledgment also protects the sender’s plans: a colleague who hears “I’ll look at this on Monday” can decide whether Monday works or ask someone else.

Should you use emojis in work emails?

Skip emojis in a first or formal work email, and follow the other person’s lead once you know them. Two research teams found that smileys cost a writer some credibility with a stranger; they disagree about when smileys add warmth.

In three experiments published in 2018, Ella Glikson, Arik Cheshin and Gerben van Kleef showed people a work email from someone they had never met, with or without smileys. The smileys made the writer seem less competent and no warmer. In the third experiment the competence penalty appeared only in a formal context, while in an informal one the smileys made the writer seem warmer.⁸ The samples were small, the largest about 200 Amsterdam students.

A larger, independent replicationreplication: Running a study again with fresh data and the same method, to see whether the original result comes back. A finding that fails to replicate is not automatically wrong, but it stops being something you can lean on.Full entry in the glossary of that third experiment, published in 2023 with 847 participants, found that smileys lowered perceived competence and raised perceived warmth whatever the context.⁹ Taken together, the two papers point to a trade-off: a smiley buys some warmth at the price of some credibility, and with someone new, credibility is usually what you need first. Both tested first impressions only.

Norms also shift by country, industry and team, as the Culture Map’s eight scales show for directness and formality. With a new contact, put the warmth in words (“Thanks, this helps a lot”); once they use emoji with you, an occasional one in reply is a safe match.

After-hours email: expectations weigh more than minutes

In the research on after-hours email, strain is linked more to feeling expected to watch email than to the minutes spent on it. In a 2020 study of 570 working adults surveyed at separate times (the abstract does not say in which country), Liuba Belkin, William Becker and Samantha Conroy linked organizational expectations to monitor email outside work hours to emotional exhaustion and worse work-life balance, and found that time spent on after-hours email was not the main driver.¹⁰

A companion paper by the same researchers, reporting three studies, two with US samples and one of 138 full-time employees and their partners, linked those expectations to higher reported anxiety and to poorer health and relationship satisfaction, for the partners as well as the employees.¹¹ Both rest on surveys and diaries, which can reveal a link, though not whether the expectations caused the harm.

Some countries have written the issue into law. Since 2017, France has required employers with union representatives to negotiate how staff exercise the right to disconnect, according to the French safety institute INRS.¹² A 2021 law in Ontario, Canada, requires employers with 25 or more employees to have a written policy on disconnecting from work.¹³ In Australia, employees have had the right since August 2024 (August 2025 at small businesses) to refuse to monitor, read or answer work contact out of hours unless that is unreasonable.¹⁴ Elsewhere, check your own country’s labour rules and your employer’s policy.

Managers can state the team’s after-hours norm out loud; a junior colleague who reads “answers can wait until morning” in a team note no longer has to guess. Anyone can use a scheduled send and an urgency line (rules 19 and 20) to write when it suits them without moving the pressure into someone else’s evening.

Email etiquette rules to drop

Three familiar rules are outdated or depend so much on place that they fail as universal rules, though each still fits some settings.

Always open with “Dear”

“Dear” still suits a formal first email to someone new; as a rule for every email it fails, because greeting habits vary by workplace. A 2007 study of 515 emails from two New Zealand workplaces found that workplace culture shaped how often and how people used greetings and closings more than status, social distance or gender did; in one of the two organizations, greetings were not widely used.¹⁵ Start formally with someone new, then mirror what they use.

Never use emoji with anyone

Both smiley studies tested first impressions of a stranger. Nobody has measured the effect between colleagues who already write to each other that way, so a ban on all emoji with everyone goes beyond the evidence. Keep the caution for new contacts and formal messages.

Reply within the hour

No study supports a one-hour standard for non-urgent email, and the urgency-bias experiments suggest most senders do not expect one. Agree on turnaround times with your team, keep fast replies for requests that are urgent, and let rule 9, the quick acknowledgment, carry the courtesy.

The other rules rest on common practice and on how email programs work; nobody has tested them as etiquette, so treat them as defaults your team can adjust.

Before a work email goes out

• It needs to be an email, not a call
• Every recipient is the right person, on the right line
• Any line that could be read two ways is rewritten
• Reply all is used only if everyone needs the answer
• It says when I need an answer, or that there is no rush
• If it is late, it is scheduled for the reader's morning

The bottom line

Most email etiquette comes down to sparing the reader a guess about who should act, how a line was meant and how soon a reply is due. On your next non-urgent email, add one line giving the date you need the answer by, and if it is late in the day, schedule it for the reader’s morning.