What to Check Before You Hit Send

Wrong recipient, missing attachment, a subject that no longer matches the message. A quick checklist to run through before you send an email that matters.

TL;DR

• Autocomplete picks the wrong recipient more often than any other email mistake, so read the To, CC and BCC lines name by name before sending.
• Attach files before you write about them, and test every link yourself, because a broken link or missing attachment undermines the whole message.
• Read important messages aloud to catch tone problems, since your mind silently corrects errors when you proofread with your eyes alone.
• For routine messages, aim for roughly 50 to 125 words, standard capitalization, no text abbreviations and no jokes that could be misread.
• If a message is accurate but will make someone angry, save it as a draft and reread it in the morning before deciding to send it.

The send button moves fast. Most days you write message after message on autopilot, replying, forwarding, attaching files, and tapping send without a second look. That works fine for routine notes, but the emails that matter, the proposal to a client, the difficult note to your manager, the application for a job you want, deserve a slower pass. This checklist covers the checks worth making before those messages leave your outbox, and most of them take less than a minute.

Who Is Actually on This Message?

Wrong recipients are the most common and most damaging email mistake, and autocomplete is usually the cause. Every mail app suggests addresses as you type, and similar names sit right next to each other. Before you send:

• Read the To line slowly, name by name. Confirm each address is the person you meant, not a colleague with a similar name.
• Check CC and BCC separately. These fields behave differently, and picking the wrong one changes who sees your message. If you are unsure where someone belongs, our guide to CC, BCC or reply all breaks down the choice.
• Look at the From address. If you manage several accounts, confirm the message is going from the personal or work address you intended.
• Flag external recipients. When a message goes outside your company, double check that everything in it is fine for outsiders to see.
• Scroll down before you forward. Review the thread below your reply so you do not pass along sensitive or personal information buried earlier in the chain, and trim old messages you no longer need.
• Start a fresh message for a new topic. Reusing a long thread for something unrelated confuses recipients and can expose the old conversation to new people.

If a message does go to the wrong person, speed matters. Our guide to recovering after you sent an email to the wrong person walks through the steps in order.

Does the Subject Line Still Match the Email?

A meaningful subject line helps the recipient understand what the message is about and decide when to read it. That sounds obvious, yet subject lines drift. You reply to a thread, change direction halfway through, and the subject now describes a conversation that ended last week.

• Check that the subject describes the current message. If you started with “Question about the meeting” and ended with a budget decision, change the subject.
• Never send with an empty subject line. It reads as careless and makes the message harder to find later.
• Write the subject last if you can. It is easier to summarize a finished message than a half-formed one.
• Keep it specific. “Revised timeline for the Henderson project” beats “Update” every time.

If the subject keeps changing because the message itself wanders, the writing may be the problem. Our article on how to write an email people actually read covers how to keep one message on one topic.

Names, Numbers and Dates, Read Twice

A misspelled first name or a wrong figure in a total can do more damage than a typo elsewhere, because it tells the reader you did not pay attention to their details.

• Spell the recipient’s name exactly as they spell it. Check their signature block or the last message they sent you.
• Read every number twice. Prices, totals, invoice numbers, quantities and phone numbers deserve a second pass, especially when you typed them from another document.
• Match dates to days. Confirm that “Tuesday the 14th” actually falls on a Tuesday, and include the time zone if people are in different states.
• Watch for homophones. Their, there and they’re, and your and you’re, sound identical and slip past a quick skim.
• Look for leftover placeholders. A draft that still says “[First Name]” or “TBD” in the middle of a polished message is embarrassing in a one-to-one email and worse in a campaign.
• Learn your own patterns. Most people repeat the same handful of mistakes. Knowing yours tells you where to slow down.

Where Is That Attachment You Mentioned?

Mentioning an attachment and forgetting to attach it happens constantly, especially when you are writing on autopilot. The reverse mistake, attaching the wrong file, is worse.

• Attach the file before you write about it. Doing it in that order means the attachment is never an afterthought.
• Check it is the right version. Open it and confirm it is the final copy, not the draft with the old numbers.
• Read the file name. A document called “client_pricing_INTERNAL” sent to that client creates a conversation you do not want.
• Test every link. Click each one yourself from a test copy and confirm it opens the correct page, because a broken link makes the reader stop trusting the rest of the message.
• Check the attachment is meant for this recipient. Scanning the file for other people’s names, pricing or private notes takes seconds and prevents information from leaving the building by accident.

Read It Out Loud to Check the Tone

Silent proofreading has a known weakness: your mind reads what you meant to write, not what is on the screen. Reading aloud, or having a device read the message to you, forces you to hear every word, and it is the fastest way to catch awkward phrasing, missing words and sentences that run on.

While you read, listen for tone problems:

• Jokes and sarcasm rarely survive email. They often do not come across the way you intended, so cut them when the message matters.
• All caps reads as shouting. Use standard spelling, punctuation and capitalization, and go easy on exclamation points.
• Skip text abbreviations. Write “you” instead of “u” and spell out anything a reader might have to decode.
• Keep paragraphs short and the message brief. Recipients treat their inbox as work, so respect their time; a good target for a routine message is somewhere in the range of 50 to 125 words.
• Read the greeting and the sign-off too. A simple greeting at the top and a signature with your name and a way to reach you belong in a message to anyone you do not write to often.
• Ask for fresh eyes on high-stakes messages. A colleague who knows nothing about the project will catch what you no longer see.
• Know when email is the wrong tool. If the topic is complex, sensitive or hard to put into words, ask for a meeting instead of trading six more messages.

One more note on timing and tone: proofreading takes focus. If you are writing an important message at the end of a long day, your error rate goes up.

Should This Wait Until Morning?

Three questions separate emails worth sending now from emails worth sleeping on.

• Is it true and accurate? If you are not sure of a fact, check it before the message goes out, not after.
• Will it do any good? If the message serves no purpose for you, the recipient or the work, deleting it is a legitimate outcome.
• Is the timing right? A message can be too late to be useful, or so early that the recipient cannot act on it yet. Consider both before you send.

Anger deserves special mention. If a message is accurate and useful but will make someone furious or hurt, no rule says you must send it tonight. Save it as a draft, reread it in the morning, and you will often soften it, shorten it, or decide a conversation works better. Drafts cost nothing. Sent messages to a whole team can snowball into long reply-all threads, and counting the cost of a reply-all storm shows how one careless send eats an entire afternoon.

One Last Look on a Small Screen

Email now gets read on screens of every size, so the final check is how the message looks where it will actually be read.

• Send yourself a test copy for anything formatted, such as a newsletter, and open it on a phone.
• Check the images. Confirm they are neither too small to read nor so large they bury the text, and remember that words baked into an image are often unreadable on a small screen.
• Preview dark mode. Some colors invert badly and leave light text on a light background.
• Confirm the details one final time. Recipients, subject, attachments, From address. A slow final read of the top of the message catches most of the mistakes on this list.
• Check your signature block. Your name and a way to reach you should appear without you rebuilding it each time.

Then send it, and get back to work.

Quick answers

Q: How long should a work email be?

A: A good target for a routine message is somewhere between 50 and 125 words, long enough to be clear and short enough to respect the reader’s time. If the topic needs more, ask for a meeting instead of trading long messages.

Q: Can I undo an email after I send it?

A: Some mail apps hold a message for a few seconds after you click send and let you cancel it during that window. Outside that window, you have little control over what happens next, which is why the checks before sending matter.

Q: Should I proofread an email right before bed or first thing in the morning?

A: Proofreading takes focus, and errors climb when you are tired at the end of a long day. Save the draft and review it when your mind is fresh, especially for messages going to clients, managers or large lists.

Q: When is email the wrong tool for a conversation?

A: If the topic is complex, sensitive or hard to put into words, request a meeting instead of writing a long message. Email cannot replace a real conversation when emotions or many details are involved.

Email services change their settings and menus often. This guide is general information, not legal or professional security advice; check your provider’s help pages and official sources such as FTC.gov and CISA.gov.