May 14, 2018 - Possible reasons for receiving multiple copies of email messages. Loop prevents you from receiving any mail, causing mail sent to you to.
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. The result is two messages in the Sent Items folder every time you send a message. This seems to be most common with Gmail accounts but other IMAP accounts may be affected as well.
![Copies of mail envelope Copies of mail envelope](/uploads/1/2/5/6/125650591/979400727.jpg)
Change the IMAP Account's Sent Options First, check your settings for saving Sent items. Open File, Account Settings. Double click on your IMAP account then click More Settings. In Outlook 2013 and 2016, look on the Advanced tab. In Outlook 2010, check the options on the Sent Items tab. Choose the option for Do not save copies of sent items and send a test message to see if the problem persists.
Note: this setting will not remove existing duplicated sent messages. It will prevent duplicates from being created going forward. Change Outlook's Global Options If you have only one email account in your profile, you could use the option to not save sent messages. This is in File, Options, Mail, in the 'Save messages' section, uncheck the option to Save copies of messages in the Sent folder.
Note that this setting will apply to all accounts - if you have more than one email account configured, you will not save sent items for any account. For this reason, you need to be careful using the global setting in File, Options as not all mail servers will save a sent item for you when sending.
![Outlook For Mac Multiple Copies Of Mail In Sent Outlook For Mac Multiple Copies Of Mail In Sent](https://support.content.office.net/en-us/media/2b9f2ac5-2efa-45a4-bd3f-80d86d54a268.png)
It's better to disable the option to save sent items on the More Settings, Sent folder tab. You're the second person who told me it didn't stick on restarts. I had him set the value in the registry - not sure how long it stuck, but he hasn't complained about it again. The profile key is HKEYCURRENTUSER Software Microsoft Office 16.0 Outlook Profiles profile-name 9375CFF0413111d3B88A00104B2A6676- then there is a key under it with subfolders - the subfodlers are named 000000nn - find the imap account. The account name and server names will be easy enough to see on the right side. When you find it, it's in the QWORD 'IMAP Sentitems flag' Hexadecimal value of 8 = dont save sent.
If you change it to 8, does it stick? Sorry I missed this earlier. If the change won't stick, you need to edit the registry.
Unfortunately, I can't provide a ready to use reg file because its slightly different on every computer. You'll need to edit the registry yourself.:( On the start menu, type regedit and press enter. Browse to HKEYCURRENTUSER Software Microsoft Office 16.0 Outlook Profiles Outlook 9375CFF0413111d3B88A00104B2A6676, where the bolded Outlook is the name of your profile (default is Outlook, but it might be something else). Look through the keys to find your IMAP account.
Change the value of the 'IMAP Sentitems flag' tto 8 (hexadecimal.