Why Am I Getting Duplicate Emails in Outlook?

Written by sean o'rourke
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Why Am I Getting Duplicate Emails in Outlook?
Creating multiple aliases to the same inbox can result in duplicate messages from automated e-mail newsletters. (Jupiterimages/Comstock/Getty Images)

Working with a computer program that seems to be malfunctioning can be frustrating. This notion can be especially true with Microsoft Outlook, which many people depend on daily for e-mails, contacts and calendars. Often settings in Outlook that are meant to help with organising messages, such as rules or syncing with a mobile device, duplicate e-mail messages and provide other undesired results. Before reinstalling Outlook, inspect your rules, mobile sync options and account settings to ensure engaged settings are not duplicating your e-mail messages.


Outlook can duplicate messages based upon rules that the user has configured to incoming e-mail messages. For example, when multiple rules apply to a single incoming e-mail, Outlook will duplicate the message so it will arrive in all folders and in-boxes where the rule applies.

Duplicate Accounts

If you use multiple e-mail accounts through Outlook, be sure that each account is individually unique and separate from the other accounts. If a user has set up multiple aliases for a single inbox account, it is possible they will receive multiple duplicate e-mails in the same inbox.

Reinstalling Outlook

If you've reinstalled Outlook on your computer, e-mail messages, contacts and other files could be duplicated as the program repeats information that is already stored in your inbox or on your mobile device.


Duplicate e-mails may appear in Outlook because the user setting, "Leave Messages On the Server" may be engaged. The "Leave Messages On the Server" forces the inbox to download messages from the POP 3 server that houses a user's Outlook information. The setting may be turned off inside of the 'tools' section listed under 'accounts'.

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