If you have only one email account in your profile, you could use the option to not save sent messages. It will prevent duplicates from being created going forward. Note: this setting will not remove existing duplicated sent messages.
In Outlook 2010, check the options on the Sent Items tab.Ĭhoose the option for Do not save copies of sent items and send a test message to see if the problem persists. Double click on your IMAP account then click More Settings. In Outlook 2013, to check your settings for saving Sent items, open File, Account Settings. Click the Email accounts button, double click on your account then click More settings. This is the control Panel > Mail dialog, but you can open it right from Outlook: Go to File > Account Settings > Manage Profiles. If you are using Outlook 2016/2019 and have the Simplified account setup dialogs, you'll need to check the Advanced settings from Manage Profiles. This seems to be most common with Gmail and Yahoo-hosted accounts but other IMAP accounts may be affected as well. The result is two messages in the Sent Items folder every time you send a message. In the case of IMAP accounts, Outlook saves a sent message in the IMAP account's Sent message folder and your IMAP mail provider may also save a copy.
