How to prevent duplicate sent items for Gmail IMAP account in Outlook?
Recently, when I send an email via a Gmail IMAP account in Microsoft Outlook, double sent email copies are saved in the Sent Items folder automatically. I search for some reference and finally get a method to fix it. Here I will share the method to prevent duplicate sent items for Gmail IMAP account in Microsoft Outlook 2010 and 2013.
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The following steps will walk you through preventing duplicate sent emails in the Sent Items folder of Gmail IMAP account in Microsoft Outlook 2010 and 2013.
Step 1: Open the Account Settings dialog box with clicking the File > Info > Account Settings > Account Settings.
Step 2: In the Account Settings dialog box,
- Go to the E-mail tab;
- Click to highlight the Gmail IMAP account that you will prevent duplicate sent emails;
- Click the Change button.

Step 3: In the Change Account dialog box, click the More Settings button at the bottom-right corner. See screen shot:

Step 4: In the popping up Internet E-mail Settings dialog box , please go to the Advanced tab (or Send Items tab in Outlook 2010), check the option of Do not save copies of sent items in the Sent Items section, and click the OK button. See screen shot:

Step 5: Now you go back to the Change Account dialog box, and click the Next button at the bottom.
Step 6: It will take some time to test the modified account settings. After test finishing, please click the Close button in the Test Account Settings dialog box.

Step 7: In the new popping up Change Accounts dialog box, please click the Finish button.
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