You send an email mentioning an attachment but forget to attach the file. Outlook can detect this and warn you before the message goes out. This feature scans your email body for specific keywords that suggest a file should be attached. The default list of keywords may not fit your specific work language or common phrases. This article explains how to access and customize the list of trigger words for the attachment reminder.
Key Takeaways: Customizing the Attachment Reminder
- File > Options > Mail > Attachment Options: Opens the dialog where you can add, edit, or remove keywords that trigger the forgotten attachment warning.
- Add Keyword: Type a new word or phrase and click Add to include it in the reminder’s detection list.
- Remove Keyword: Select an existing keyword from the list and click Remove to stop Outlook from checking for it.
How the Outlook Attachment Reminder Works
The forgotten attachment reminder is a built-in safety feature in Outlook. When you click Send, Outlook quickly scans the text of your email message. It looks for any words or phrases from its predefined list, such as “attached” or “enclosed.” If it finds one of these keywords but detects no files attached to the email, a warning dialog box appears. This dialog asks if you meant to send the email without an attachment.
The feature is enabled by default. You do not need any special add-ins or a specific account type to use it. The reminder works for new emails, replies, and forwards. It checks for both traditional file attachments and modern cloud attachments from OneDrive or SharePoint. The list of trigger words is stored in your Outlook profile and is independent of your mail server.
Limitations of the Default Keyword List
The default list includes common English words like “attachment,” “attached,” and “enclosed.” However, it may not cover industry-specific jargon, acronyms for documents, or non-English terms you regularly use. For example, if your team always says “see the spec sheet” or “review the PDF,” those phrases will not trigger a warning unless you add them. The reminder also cannot understand context, so it may give false warnings if you use a keyword like “attach” in a different sense.
Steps to Add or Remove Reminder Keywords
You can manage the list of phrases that activate the warning. Follow these steps to customize it for your needs.
- Open Outlook Options
In Outlook, click the File tab on the ribbon. In the backstage view, select Options at the bottom of the left-hand menu. This opens the Outlook Options window. - Navigate to Mail Settings
In the Outlook Options window, select the Mail category from the left sidebar. Scroll down through the list of mail settings until you find the Send messages section. - Open Attachment Options
Within the Send messages section, click the button labeled Attachment Options. A new smaller dialog box titled Attachment Options will appear. - Manage the Keyword List
The Attachment Options dialog shows a list box containing the current warning words. To add a new keyword, type it into the text box below the list and click the Add button. To remove a keyword, select it from the list and click the Remove button. You cannot edit a keyword directly; you must remove the old one and add the corrected version. - Save and Close
Click OK to close the Attachment Options dialog. Click OK again to close the Outlook Options window. Your changes are saved immediately. The new keyword list will be used the next time you send an email.
Common Mistakes and Limitations to Avoid
The Reminder Does Not Appear for a Specific Word
If you added a keyword like “document” but no warning appears, check your spelling in the list. The check is case-sensitive. If you added “Document” with a capital D, typing “document” in lowercase in your email may not trigger it. Add both the capitalized and lowercase versions if necessary. Also, ensure the feature is still enabled in File > Options > Mail under the Send messages section.
Outlook Shows a Warning When No Attachment is Needed
You might write “I’ve attached the details to this project” as a figure of speech. Outlook will flag this if “attached” is in your keyword list. You can click Send Anyway in the warning dialog. To prevent future false alarms for that specific phrase, consider removing the overly broad keyword from your list and replacing it with more precise terms.
Keywords Not Detected in Signatures or Disclaimers
The reminder primarily scans the composed message body. Text that is part of your email signature or an automatic legal disclaimer may not be scanned. Do not rely on the reminder to catch attachment references in those static blocks of text. Always manually check emails that include standard text suggesting a file is included.
Default Keywords vs Custom Keywords: A Comparison
| Item | Default Keywords | Custom Keywords |
|---|---|---|
| Examples | attached, attachment, enclosed, here is | PDF, spreadsheet, see file, review doc |
| Language Scope | General business English | Your team’s jargon and specific terms |
| Setup Required | None, included with Outlook | Manual addition via Attachment Options |
| Case Sensitivity | Case-sensitive matching | Case-sensitive matching |
| Management | Cannot be edited individually | Can be added or removed at any time |
You can now tailor Outlook’s safety net to match the exact language you use every day. Adding specific project names or file types can make the reminder more accurate for your work. For another useful send-time check, explore the MailTip feature that warns you when replying to large distribution groups. A related advanced tip is to use a VBA macro for even more complex attachment checks, such as verifying that a specific file name mentioned in the body is actually attached.