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To stop Outlook saving sent-message copies, first check your Outlook version and account type. In Classic Outlook for Windows or Outlook for Mac, an IMAP account has a specific setting that can prevent Outlook from adding its own copy. Classic Outlook for Windows also has a general Sent Items setting when it is available. These options do not necessarily stop your email provider or employer from retaining a copy. If you want to free up disk space rather than remove messages from Sent Items, change offline synchronization or archive mail instead.
First, identify what you want to stop
“Saving sent emails” can mean several different things:
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- A copy in Sent Items: the sent message is stored in the mailbox’s Sent Items, Sent, or Sent Mail folder. This is usually what people mean.
- Duplicate copies: Outlook and the mail provider may each save a copy of the same message.
- A local copy on your computer: Outlook may cache mailbox data for offline access. Disabling Sent Items copies does not necessarily turn off that caching.
- All retention: stopping every server, archive, or compliance copy is not generally controlled by an Outlook preference.
Also identify your app before following steps. Classic Outlook for Windows has the traditional File menu and File > Options. New Outlook for Windows is a separate experience with different settings. Outlook for Mac has top-menu commands such as Tools > Accounts; Outlook on the web runs in a browser. Desktop steps do not apply to Outlook mobile. Microsoft distinguishes the New and Classic Windows apps in its Outlook for Windows guidance.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesClassic Outlook for Windows: stop the extra copy for an IMAP account
This is the relevant fix when an IMAP account—such as one from Gmail, Yahoo, AOL, or another provider—shows duplicate sent messages because both Outlook and the provider save one.
- Open File > Account Settings > Account Settings.
- Select the IMAP account, then choose Change.
- Clear Don’t save copies of sent items.
- Select Next, then Done.
The label is easy to misread: follow the documented action and clear the checkbox. This tells Outlook not to add its own sent copy; the provider may still save one on its server. Microsoft documents this as a workaround for duplicated IMAP sent messages, but notes that provider behavior can affect the result. See Microsoft’s Windows IMAP duplicate-message guidance.
Classic Outlook for Windows: turn off the general Sent Items copy setting
If you want Outlook not to save its own Sent Items copy, and the control is available for your account, open File > Options > Mail. Under Save messages, clear Save copies of messages in the Sent Items folder, then choose OK. Microsoft documents this setting for supported classic desktop editions, including Microsoft 365, Outlook 2024, 2021, 2019, and 2016. Its behavior and availability depend on the account configuration; it is not a universal control for every Outlook app or mailbox. See Microsoft’s guide to where sent messages are saved.
To check your account type in Classic Outlook, use File > Account Settings > Account Settings. The account list identifies the configured account. If you do not see the expected checkbox, do not assume that a different menu path will work: you may be using New Outlook, a non-IMAP account, or a managed account whose behavior is controlled elsewhere.
Outlook for Mac: stop Outlook’s copy for an IMAP account
- Open Tools > Accounts.
- Select the IMAP account.
- Choose Advanced, then open the Folders tab.
- Select Don’t store a copy of sent messages, then choose OK.
This is intended to prevent Outlook from uploading a second copy when the provider automatically puts sent mail in its server-side Sent folder. Microsoft describes the option as a workaround for duplicate messages in its Outlook for Mac IMAP guidance.
New Outlook, Outlook on the web, and Outlook.com
Do not apply the Classic Outlook menu paths automatically. Microsoft’s documentation separates New Outlook from Classic Outlook, and the sources for the classic Sent Items checkbox do not establish that the same control is available in New Outlook. If you cannot find a sent-copy setting in New Outlook, do not use registry edits or assume that a classic Outlook fix applies.
For Outlook on the web, Microsoft says sent messages are placed in Sent Items by default. Its web folder guidance does not document an equivalent ordinary user-facing switch to disable that behavior. If you use only the web app, the available control may depend on the mailbox provider or your organization’s administrator. Outlook.com and Microsoft 365 accounts may also have mailbox-side behavior that a desktop preference cannot override.
If you are trying to fix duplicate sent messages
With IMAP, the provider may automatically place the outgoing message in its server-side sent folder, while Outlook also uploads or stores a copy. Both copies then appear in the folder Outlook displays as Sent Items, Sent, or Sent Mail. The folder name alone does not tell you which component made the copy.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Use the IMAP-specific Windows or Mac setting above to stop Outlook’s extra copy. Then send a test message and check the mailbox in the provider’s webmail as well as in Outlook. If duplicates remain, check whether another phone or mail client, a second Outlook account configuration, or a provider-side rule is also saving a copy. The setting may not resolve every provider-specific symptom. Microsoft notes, for example, that BCC details in sent-message entries can depend on the provider; check the provider’s behavior before relying on the workaround.
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Turning off sent copies is not the same as limiting local mailbox data. Outlook can keep offline copies of mail, calendar items, and other data; New Outlook’s offline feature, in particular, stores data on the device. For a cached Exchange or IMAP account, reducing the period of mail kept offline may better address local storage. Look for the account’s offline synchronization setting, sometimes labelled Mail to keep offline; the exact control varies by Outlook version and account.
If mailbox capacity is the issue, consider archiving older messages, removing large attachments where appropriate, or using cloud links instead of repeatedly attaching large files. Microsoft notes that sent messages and attachments contribute to mailbox use in its Outlook attachment guidance. For business accounts, ask the administrator about archive and retention policies rather than deleting records that may need to be retained.
Quick Recap
What the setting does—and does not—change
- It affects future messages. Turning off a sent-copy setting does not automatically remove messages already in Sent Items. Delete or archive existing messages separately if that is what you intend, subject to mailbox policies.
- You may lose your convenient sent-mail record. If Outlook stops saving a copy and the provider does not create one, you may have trouble finding, forwarding, resending, or documenting what you sent. Confirm that one usable server-side copy remains before relying on the change.
- It does not guarantee that nobody retains a copy. The recipient may have the message, and providers or organizations may retain server logs, archives, journals, or compliance copies. A user preference does not necessarily override retention rules, litigation holds, or administrator controls.
- It does not stop drafts or all local caching. Unfinished messages are handled as drafts, and offline mailbox data is controlled separately.
- Shared mailboxes can behave differently. Depending on Microsoft 365 configuration and permissions, a message sent from a shared mailbox may be copied to the sender’s mailbox, the shared mailbox, or both. Ask your administrator to confirm the configuration; there is no single verified end-user switch that applies to every shared mailbox.
If the setting is missing or the messages still appear
- Checkbox missing: confirm whether you are in Classic Outlook, whether the account is IMAP, and whether your organization manages the mailbox. The cited classic settings are not universal New Outlook, web, or mobile controls.
- Duplicates remain: check the provider’s webmail and other connected devices or apps. The provider may be creating a copy independently of Outlook.
- A sent message disappears: check the mailbox in webmail, the Outbox (it may not have sent), Deleted Items or Trash, the offline synchronization period, and whether you sent from a different account. Microsoft lists failed sending, synchronization limits, and deletion among reasons a message may not be visible; see how to view sent email.
- You use Exchange, Microsoft 365, or Outlook.com: sent-item handling is generally more mailbox-managed than the IMAP-specific client-copy workaround. If the setting does not apply, ask the provider or administrator what is creating the copy and what retention policy applies.
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