Duplication of Sent items in Outlook after changing settings to stop this

Elisabeth 0 Reputation points
2026-09-02T07:13:49+00:00

My email account has suddenly started to duplicate sent emails despite the fact my settings do not allow this. Does anyone know how to overcome this problem without telling me to go to Settings>Change>Don't save copies sent (as I've already done this).

I've looked at other questions about this and can't see anything that specifically answers the problem.

Any help would be appreciated.

Outlook | Windows | Classic Outlook for Windows | For home
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  1. Hendrix-V 18,225 Reputation points Microsoft External Staff Moderator
    2026-09-03T04:41:21.0666667+00:00

    Hi Elisabeth,

    It sounds like you've already confirmed the usual "Don't save copies of sent messages" setting, so the duplication may be occurring elsewhere in the account or Outlook configuration rather than from that option alone.

    You could try the following quick checks:

    1, Start Outlook in Safe Mode

    • Press Windows + R, type outlook.exe /safe
    • Send a test email and check whether duplicates are still created.

    2, Review any additional mail accounts

    • Go to File > Account Settings > Account Settings
    • If multiple accounts are configured, check whether more than one account is saving sent items to the same mailbox.

    3, Test in Outlook Web

    • Send a message from Outlook on the web.
    • If duplicates appear there as well, the behavior may be related to the mailbox rather than the Outlook desktop client.

    4, Create a new Outlook profile

    • Open Control Panel > Mail > Show Profiles
    • Create a new profile and test with the account.

    If this behavior started recently and no configuration changes were made, it may also be worth checking whether any Outlook add-ins or recent updates coincide with when the issue began.

    Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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