Flagging an email marks it for attention or follow-up; it does not automatically mean the message is spam, dangerous, or unread. What happens next depends on the email app: Outlook flags can connect to reminders and task views, while Gmail and Apple Mail use their own ways to mark messages for later.
What an email flag does
A flag is an organizational cue: it helps you find a message again or remember to act on it. In Outlook, you can flag a received message for follow-up or flag a sent message to track a response. Depending on the Outlook version and settings, you can add a reminder and choose a due date such as Today, Tomorrow, This Week, Next Week, No Date, or Custom. Flagged items may appear in the To-Do Bar, Tasks, or Calendar Daily Task List. Microsoft’s Outlook guidance covers Outlook for Microsoft 365, Outlook 2024, and Outlook 2021.
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A normal personal flag is not, by itself, a notification to the sender or recipient. Outlook does have a separate option to set a flag for recipients; if the recipient also uses Outlook, the item can be added to their to-do list, and a reminder may be included.
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Outlook.com
In Outlook.com, a flag is a visual reminder to return to a message, and you can filter the message list to show flagged mail. Microsoft 365 account holders can also add a reminder to a flagged item. Pinning is a separate action that moves a message to the top of the inbox. Microsoft’s Outlook.com instructions describe both options.
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Gmail
Gmail does not use an identical Outlook-style follow-up flag. To make a message stand out, you can star it and then view or search for starred messages. To have a message return later, snooze it and choose a day and time. Google describes these as ways to organize and revisit messages in its Gmail organization guidance, which primarily covers desktop and web.
Apple Mail on Mac
In Mail on Mac, you can flag one or more messages, see the flag in the message header, and find flagged messages in the Flagged mailbox. You can clear flags, rename them, and use different colors; the Flagged mailbox appears in the sidebar when you use more than one flag. These instructions apply to Mail on Mac, not automatically to every Apple device. Apple’s Mail for Mac guide also documents Follow Up Suggestions, a separate feature: if a sent message gets no response in three days, it can resurface at the top of the inbox. You can ignore a suggestion or turn the feature off in settings.
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Flagging versus starring, snoozing, pinning, and archiving
| Action | What it does |
|---|---|
| Flag (Outlook) | Marks a message for follow-up; reminders and task views may be available. |
| Star (Gmail) | Makes a message stand out so you can find or search for it later. |
| Snooze (Gmail) | Hides a message until a chosen later day and time, when it returns. |
| Pin (Outlook.com) | Moves a message to the top of the inbox. |
| Archive (Gmail) | Removes a message from the inbox while keeping it in All Mail. If someone replies to an archived conversation, Google says it returns to the inbox. |
These actions are not interchangeable. Gmail also treats muting a conversation, reporting spam, and deleting a message as separate actions from archiving, starring, or snoozing. Google’s guidance explains the Gmail controls.
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Mark Complete
Use Mark Complete when the follow-up is done but you want to retain an indication of completion. Outlook changes the flag to a check mark and keeps a record in applicable task views.
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Clear Flag
Use Clear Flag to remove the follow-up status and its record from follow-up views. If you clear a flag on a sent message, Microsoft says that changes what you see; recipients still see the flag. Microsoft’s Outlook instructions explain the difference.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to use a flag
- Flag a received Outlook message when you need to act on it later.
- Flag a sent Outlook message when you want to track whether someone responds.
- Use a reminder when the follow-up needs a specific time or date.
- In Gmail, star a message you want to find easily; snooze it when it should return at a chosen time.
- In Mail on Mac, flag messages you want to collect in the Flagged mailbox.
Exact options and interface labels can vary by app version, platform, and account type. The behavior described here is documented for Outlook, Outlook.com, Gmail, and Mail on Mac; other email services may work differently.
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