Writing a clear email, subject line to sign-off

Put what you want in the subject line and the first sentences, and end with the next step, a sign-off that fits the reader and your full name.

A clear email, subject line to sign-off. A clear email to a teacher or professor puts the course code and the ask in the subject line, greets the reader by title and last name, and says who you are and what you want in the first two sentences, before context, a next step, a sign-off and your full name. "Sincerely" and "Yours truly" suit most messages; "Regards" and "Best regards" suit someone you know. — **Fig. 3.5** A clear email to a teacher or professor puts the course code and the ask in the subject line, greets the reader by title and last name, and says who you are and what you want in the first two sentences, before context, a next step, a sign-off and your full name. "Sincerely" and "Yours truly" suit most messages; "Regards" and "Best regards" suit someone you know. Source: Language Portal of Canada; University of Manitoba; University of Illinois Writers Workshop.

Area: PeopleFrom age 12Time to learn: 15 minutes

Write a short subject line that names the topic and the ask, greet the reader by title and name, say who you are and what you want in the first two sentences, add only the context they need, then close with the next step, a sign-off such as "Sincerely," and your full name.

Why it matters

Your reader is probably skimming: Microsoft's 2025 workplace data found that the average worker receives 117 emails a day and skims most of them in under 60 seconds. Government of Canada writing advice is to keep each email to one subject and within one screen, about 25 lines or 250 words, with a subject line clearly linked to the message. If the ask is in the subject line and the first sentence, the reader sees it even on a skim.

How to do it

Decide the one thing you want, such as an answer, a meeting or a file, and keep the email to that one subject. For school, check the syllabus or course website first. If the topic is complicated or sensitive, or you have bad news to give, ask to talk by phone or in person instead.
Write a short subject line that says what the email is about: "Agenda – Meeting about communications strategy", not "Meeting today". For a teacher or professor, put the course code first: "ENGL 101: Request to meet about my essay". Never leave it blank.
Greet the reader with "Dear" or "Hello" and their title and last name: "Dear Professor Brown," or "Hello Dr. Grant,". Use their first name only if you are already on a first-name basis. If you are not sure of their title, write "Dear" and their full name; if you do not know their name, use their role, such as "Dear Customer Service Manager".
If the reader may not know you, say who you are in one sentence: your full name and, for school, your class and section. Some schools also ask for your student number or ID.
Put the ask in the first sentence or two, as a direct question: "Can we meet Tuesday at 9:30 a.m. to discuss my essay structure?"
After the ask, add only the context the reader needs: what happened and what you have already tried. Keep the whole email within one screen, about 25 lines or 250 words, and apologize once at most.
End with the next step and any deadline: another time that works, or what you need and by when. Ask for something like a reference letter at least 2 weeks before it is due.
Sign off to fit the reader. "Sincerely" and "Yours truly" work for most messages; "Regards" or "Best regards" suit someone you know through work or school; "Best wishes" or "Warmest regards" suit a warm message to a colleague you know well. Capitalize only the first word and add a comma, then type your full name. In a work email, add a signature block with your contact information.
Before you send, reread for spelling and tone, check who is in the To and Cc lines, and attach any file you mention. Flag the email as important only if it is truly urgent, and for school, send it from your school email account.
If you get no reply within five business days, send one short, polite email asking whether they received your first message.

Common mistakes

A blank or vague subject line, such as "Hi" or "Question", that does not say what the email is about.
Burying the ask under background and apologies, so the reader has to hunt for it.
Writing to a teacher, professor or manager the way you text a friend: no greeting, abbreviations like "u", ALL CAPS, which reads as shouting, or emoji.
Writing "see attached" and forgetting to attach the file.
Replying right away to an email that made you angry. Give yourself 24 hours, or deal with it by phone or in person.

You can do this when …you can write an email to a teacher, professor or manager that they could act on from the first two lines: a subject line with the topic and the ask, a greeting with their title and name, one clear question, a next step, a sign-off and your full name.