How to Check Spelling in Outlook: 3-Click Proofreading for Error-Free Emails

To check spelling in Outlook, you only need three clicks—or one shortcut—before every email looks polished. ✨ I’ve sent enough embarrassing typos to know how critical this tool is, especially when replying to clients or managers.

The spell-checker in Outlook works differently than Word, so most people miss its quickest shortcuts.

Outlook’s spell-check runs automatically when you send an email, but you can trigger it manually in drafts by pressing F7 or clicking the Spelling & Grammar button under the Review tab.

For deeper control, dive into File > Options > Mail > Spelling to customize ignored words or add custom dictionaries—this is where Outlook’s checker finally feels as smart as Word’s.

You’ll catch typos before they leave your inbox, avoid the awkward "oops" replies, and even train Outlook to recognize industry terms it flags incorrectly. The process takes under 30 seconds once you know the shortcuts, and it works the same in both desktop and web versions.

No more guessing if that autocorrect suggestion was right.

For stubborn false positives or team-specific jargon, the custom dictionary feature saves time. Just add the terms once, and Outlook remembers them across all your emails.

This is the one tweak that makes Outlook’s spell-check feel as reliable as the old IBM Selectric my dad used to proofread contracts on—no more wasted keystrokes.

What you need

Step-by-step instructions for proofreading emails in Microsoft Outlook

Here's how to enable and use Outlook's built-in spelling checker in just seconds.

Open a new email in Outlook by clicking New Email in the Home tab. Before typing, ensure the Spelling & Grammar option is enabled—it's on by default, but worth confirming. You'll see the ABC icon in the bottom-right corner of the compose window.

If the icon is missing, click File > Options > Mail, then scroll to the Compose messages section. Make sure Mark items as read when viewed on the web isn't interfering with your compose window's toolbar. The spelling checker should now appear as a blue checkmark icon.

As you type, Outlook will underline potential spelling errors in red wavy lines. To check the entire message at once, press F7 or right-click the ABC icon and select Spelling & Grammar. The dialog box will appear with your first suspected error.

Review each suggestion carefully—Outlook sometimes flags proper nouns or specialized terms incorrectly. If you're certain a word is correct, add it to your Safe List by clicking Ignore All or Add to Dictionary. This prevents future false flags for that term. Always check the Suggestions list before dismissing a flagged word.

For more control, click File > Options > Mail, then select Spelling in the left pane. Here you can set Outlook to check grammar automatically (Check grammar with spelling), adjust ignore mixed case settings, and specify which dictionaries to use. I recommend enabling Check names to catch typos in recipient fields.

Under Proofing, add any specialized dictionaries you use frequently—like technical terms or industry jargon. Click Custom Dictionaries to manage these lists. This is especially useful if you work in fields with unique terminology that Outlook might otherwise flag as errors.

Before sending any email, give it a final scan by pressing F7 one last time. Pay special attention to names, dates, and numbers—these are common areas where Outlook's checker might miss context-specific errors. If you're emailing multiple recipients, double-check each name in the To field.

For critical emails, consider using the Review tab's Read Aloud feature—hearing the email can catch awkward phrasing or missing words that visual checks might miss. This step takes just seconds but can save you from embarrassing mistakes.

Tips & tricks for perfect Outlook proofreading

Mastering Outlook's spelling checker takes more than just pressing F7—here are the nuances that turn good emails into polished professional correspondence.

Keyboard Shortcut Secret: The F7 shortcut works instantly, but did you know you can also right-click the blue ABC icon in the bottom-right corner of your compose window? This gives you the same spelling dialog box without reaching for your keyboard. For those who prefer mouse navigation, this is a game-changer. I've seen people miss this for years—don't be one of them!

Safe List Strategy: When Outlook flags a term you know is correct—like a brand name or technical jargon—always add it to your Safe List instead of just ignoring it once. Click "Add to Dictionary" in the spelling dialog box to permanently exclude it from future checks. This prevents constant interruptions for terms you use regularly, like "Microsoft Teams" or "AI-driven analytics." I've added over 50 terms to my personal Safe List across different projects.

Custom Dictionary Power: The Custom Dictionaries feature in Outlook's proofing settings is underutilized. Click File > Options > Mail > Spelling, then select "Custom Dictionaries." Here you can import specialized dictionaries for industry terms, acronyms, or even create your own. For example, if you work in healthcare, you might add medical abbreviations like "HIPAA" or "EHR." This prevents Outlook from flagging essential terms as errors in your field-specific communications.

Read Aloud Technique: Before hitting send on critical emails, use the Read Aloud feature in the Review tab. This catches awkward phrasing, missing words, or incorrect sentence structure that visual checks might miss. The robotic voice might seem silly, but it's surprisingly effective at revealing unnatural phrasing or missing transitions. I've caught at least one embarrassing error per week using this method—it's become my final quality check before sending anything important.

Frequently asked questions

Got questions about spell-checking in Outlook? Here are answers to the most common ones—so you can send polished emails without stress!

Wrapping up and next steps

Mastering how to check spelling in Outlook is a small but powerful skill that can save you from awkward mistakes and boost your professionalism. Whether you’re using the built-in tools or third-party add-ins, taking just a few seconds to proofread ensures your emails shine with clarity and confidence. 🌟

Now that you’re equipped with these quick fixes, put your newfound skills to work—start by reviewing your next draft before hitting send! For extra polish, explore Outlook’s advanced formatting options or try a grammar-checking tool like Grammarly for even smoother communication.