Email Etiquette Guide: 15 Rules for Professional Email

Your subject line is the first thing people see — and often the only thing they read before deciding whether to open your email. Make it specific and actionable. "Q2 budget review — input needed by Friday" beats "Quick question" every time.

Nobody reads emails for pleasure. State what you need in the first line. If someone has to read three paragraphs before understanding why you emailed them, you have lost them. "I need your approval on the attached proposal by Thursday" — that is a first sentence that works.

CC someone when they need to be aware of the conversation but don't need to act. BCC when you're sending to a group and want to protect everyone's email addresses from each other (newsletters, announcements). Never BCC someone to secretly keep them in the loop — it always backfires.

You don't always have the answer immediately. That's fine. But leaving an email sitting for days with no response signals one of two things: you're disorganised, or you don't care. A quick "Got it — I'll have a full response by Wednesday" takes 10 seconds and builds trust.

Before hitting Reply All, ask yourself: does everyone on this thread actually need to see my response? If it's a "Thanks!" or "Sounds good" — reply only to the sender. Reply All pollution is one of the most universally disliked office behaviours.

Wall-of-text emails don't get read — they get skimmed or postponed. Break your email into short paragraphs. Use bullet points for lists. Bold the key action items. Make it scannable.

If someone signs off with "Cheers, Tom" don't reply with "Dear Mr. Thompson." Mirror the tone and formality of the person you're writing to. Being too formal feels distant; being too casual feels presumptuous. Find the middle ground by following their lead.

Write it if you must — get it out of your system. Then save it as a draft. Come back in an hour. You will almost always soften it, and you will almost always be glad you did. Angry emails have ended careers and destroyed relationships. The send button is permanent.

A typo in the body is forgivable. Sending confidential information to the wrong person is not. Before clicking send: check the To field, check the CC field, check the attachment. Make it a habit.

Every email you send is a micro-impression. A clean, consistent signature with your name, title, and one contact method tells the recipient you take your communication seriously. No signature at all, or a "Sent from my iPhone" default, signals the opposite.

One exclamation mark per email is fine. Two is pushing it. Three or more makes you sound like you're running a children's birthday party. Let your words carry the enthusiasm — the punctuation should just punctuate.

"Please see the attached" followed by no attachment is a universal humiliation. Attach the file first, then write the email. Most email clients now warn you if you mention "attached" without adding a file, but don't rely on that safety net.

"Best regards" and "Kind regards" are safe for professional contexts. "Thanks" works when you're asking for something. "Cheers" is fine in casual UK business culture. Avoid "Yours truly" (too formal for email) and trailing off without any sign-off at all (feels abrupt).

If you're emailing someone in a different time zone, be mindful of when your message lands. Sending a non-urgent email at 11pm their time — especially if their phone pings — is inconsiderate. Use scheduled send if your email client supports it.

If an email thread has gone back and forth 5+ times, pick up the phone or start a video call. If you need an immediate answer, use Slack or Teams. If the topic is sensitive or emotional, have the conversation in person. Email is asynchronous by design — don't force it to be a chat app.