Email etiquette is the set of unwritten rules that make email clear, polite and easy to act on. Good etiquette gets your messages read and answered. Poor etiquette makes a sender look careless, even when the content is excellent. The rules are mostly common sense, but a handful are easy to forget when you are busy: a vague subject line, an accidental reply to everyone, a tone that reads as angry, a missing attachment. This guide sets out the rules of professional email etiquette, with examples of good and bad practice, advice on tone, CC, BCC and reply all, how quickly to respond, what to put in a signature and the mistakes that cause the most trouble at work.
What is email etiquette?
Etiquette means the accepted way of behaving. In email it covers how you address people, how you structure a message, what you copy to whom, how you reply and how you sign off. Different workplaces and countries have different habits, so these rules are guidelines and not laws. When you are unsure, err on the side of being slightly more formal with someone you do not know and follow the style of the person you are answering.
The 20 rules of professional email etiquette
1. Write a specific subject line
The subject line is the first thing the reader sees and often decides whether the message is opened soon or buried. Say what the message is about and, if it matters, what you want. "Question about invoice 1043" is better than "Hello" or "Quick question". For more on this, read how to write email subject lines.
2. Use a proper greeting
Begin with a greeting and the person's name: "Hello Priya," or "Dear Dr Mehta,". Use a formal form for people you do not know or for senior contacts, and a friendlier form for colleagues you know well. Check the spelling of the name. Getting a name wrong is worse than leaving it out.
3. State the purpose in the first lines
Busy readers skim. Put the reason for the message, and any request, in the first one or two sentences. Background can follow.
4. Keep it short and structured
Use short paragraphs, plain words and, where it helps, a short list. If the message needs several pages, consider a call or an attached document and use the email to summarise it.
5. One topic per email
If you need to discuss two unrelated things, send two messages. It makes replies, searching and forwarding much easier. If a thread has drifted to a new subject, change the subject line.
6. Make requests clear and give a date
"Could you send me the signed form by Thursday?" is easier to act on than "Let me know about the form". Say who should do what, and by when.
7. Mind your tone
Email has no face or voice. A short message can read as curt, and a joke can read as sarcasm. Use polite words such as please and thank you, avoid sharp phrases and read your message once as the recipient would. Do not write in capital letters, which reads as shouting, and use exclamation marks and emoji sparingly in formal settings.
8. Never send an email when you are angry
Write the draft if you need to, then wait. Anything you send can be forwarded, saved and quoted. If an issue is delicate or emotional, a conversation is usually better.
9. Proofread
Check spelling, names, dates, numbers and links. Read the message aloud or let a spell checker help. Mistakes in a short message are very visible.
10. Use CC and BCC correctly
Put the people who must act in the To field. Use CC for people who need to be informed. Use BCC when addresses should stay private, for example in a message to many unrelated people. Do not copy a boss or a group to apply pressure, and do not use BCC to hide a copy from the main recipient in a way that would feel deceptive if discovered. Our guides explain the details: what CC means and what BCC means.
11. Be careful with reply all
Before you press reply all, ask whether everyone really needs your answer. A "Thanks!" to a list of two hundred people is noise. Reply only to the sender when your response is relevant to them alone. If someone has put you in BCC, never reply all, because you would reveal that you were copied.
12. Check the recipients before sending
Autocomplete can put the wrong person in the To field. Look at the addresses, especially when sending confidential information or messages that mention other people.
13. Attach what you promise, and keep attachments reasonable
Many people forget the attachment they mention. Attach the file first, then write the message. Large attachments can bounce or fill mailboxes, so share a link to a document instead when the file is big. See how attachments work.
14. Respond in a reasonable time
There is no universal deadline. Many workplaces expect a reply within a working day for ordinary messages. If you cannot give a full answer yet, send a short acknowledgement and say when to expect more. For urgent matters, use the phone or a chat tool, not email alone.
15. Do not use email for everything
Complex discussions, bad news, conflicts and quick back-and-forth questions are often better handled by voice, video or chat. Use email when a written record or time-shifted reading is useful.
16. Use a clear sign-off and signature
End with a closing such as "Kind regards" or "Best wishes" and your name. A simple signature with your name, role, company and a phone number helps recipients. Keep it short; see how to create an email signature.
17. Use a professional email address and display name
For work or applications, use an address based on your name or your organisation, and make sure the display name shows your real name. Avoid nicknames and jokes.
18. Use formatting with restraint
Bold can highlight a date or a request. Too many colours, fonts and images look unprofessional and may not display on every device. Plain text or simple formatting is safest. See HTML email basics.
19. Respect privacy and security
Do not forward private messages without permission, do not put passwords or payment card numbers in email and be wary of links and attachments from unexpected senders. Confirm unusual requests, especially for money or credentials, by another channel. See scam messages that imitate system notices.
20. Set an out-of-office message when you are away
Tell people when you will return and whom to contact meanwhile. See out of office message examples.
Examples of good and bad email etiquette
| Situation | Poor | Better |
|---|---|---|
| Subject line | "Help!!!" | "Access to the shared drive: request for approval" |
| Greeting | "Hey" | "Hello Daniel," |
| Request | "Need the report." | "Could you send the September report by Friday at noon? Thank you." |
| Reply to a group | Reply all with "ok" | Reply to the sender only, or react in the chat tool |
| Mistake | Ignoring the error | "Apologies, I attached the wrong file. The correct one is attached." |
| Ending | No sign-off | "Kind regards, Priya Sharma, Operations Manager" |
A short professional email template
Subject: Request for the Q3 budget summary by Friday
Hello Anita,
I am preparing the planning meeting on Monday and would like the Q3 budget summary. Could you send it by Friday at noon? If a draft is easier, that is fine.
Thank you for your help.
Kind regards,
Rohan Verma
Planning Lead, Example Company
Etiquette for people who send email in bulk
If you send marketing or notification email, etiquette becomes a deliverability matter. Send only to people who agreed to hear from you. Use a recognisable sender name. Give a clear unsubscribe link and honour it quickly. Do not use deceptive subject lines. Do not buy lists. Keep your sending domain authenticated. These habits keep complaints low and your reputation intact. See email marketing best practices, one-click unsubscribe and email reputation.
Common email mistakes and how to avoid them
- Vague subject lines. Make them specific.
- Reply all by accident. Check the To and CC fields before sending.
- Forgotten attachments. Attach first, write second.
- Typos in names. Copy the name from a reliable source.
- Long walls of text. Break them up or switch to a call.
- Emotional replies. Pause before sending.
- Forwarding chains with private content. Read the whole thread before you forward it.
- Sending sensitive data in plain email. Use a secure method.
Send business email people trust Authenticate your domain and monitor delivery so your messages arrive and look professional.
References and further reading
Frequently asked questions
What is email etiquette?
The accepted rules for writing and sending email politely and clearly: subject lines, greetings, tone, structure, copying recipients, replying, signing off and respecting privacy.
What are the most important email etiquette rules?
Write a specific subject line, greet the reader, state your purpose early, keep the message short and polite, check recipients and attachments, proofread and use reply all with care.
When should I use reply all?
Only when everyone on the thread needs your answer. Otherwise reply to the sender alone. Never reply all if you were copied in BCC.
How quickly should I reply to email?
There is no universal rule. Many workplaces expect a reply to ordinary messages within a working day. If you need more time, send a short acknowledgement with a date.
Is email etiquette different for marketing email?
The same courtesy applies, with extra duties: send only to people who agreed, use honest subject lines, include a working unsubscribe link and keep your domain authenticated.