Outlook is a popular email client that makes communication with clients and colleagues quick and convenient.
However, it cannot automatically filter and delete duplicate emails.
Why there are a variety of duplicate emails in Outlook?
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Outlook data file has reached the maximum size?
This post provides you with several useful solutions to help you fix it.
To rule out this cause, you should probably check your Outlook rules.

ClickFile>Manage Rules & Alerts.
In the new window, you will see all the rules you have created.
Finally, clickApplyandOKto make the changes take effect.

Way 2.
Here you could see how to schedule an appropriate automatic send/receive interval.
In Outlook, clickSend/Receive>Send/Receive Groups>Define Send/Receive Groups.
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By default, you’re able to only see one group namedAll Accounts.
you’re able to click theNewbutton to create a new account group.
Besides, check that the checkbox next toSchedule an automatic send/receive every XX minutesis ticked.

ClickCloseto exit the window.
How to automatically delete emails in Outlook?
How to automatically delete emails from a sender in Outlook?

This post shows you the details.
it’s possible for you to follow the steps below to use the Clean Up tool.
In Outlook, selectInboxor another mail folder and then click theClean Upicon.
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SelectClean Up FolderorClean Up Folder & Subfoldersfrom the drop-down menu.
In the new window, clickSettings.
ClickOKto save the changes.

Next, click theClean Up Folderoption.
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Are Outlook emails not showing up in Inbox?
What should you do when Outlook not showing all emails?
Try the solutions in this post.
Way 4.
ClickFile>Open & Export>Import/Export.
Select theImport from another program or fileoption and clickNext.
SelectOutlook Data File (.pst)and clickNext.
Select theDo not import duplicatesoption and clickNextorFinish.
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Way 5.
Try the ways listed above.
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