Why I Receive Duplicate Email in Outlook? – [Guide 2026]

If you are constantly receiving duplicate emails in Outlook and not sure how to fix it quickly! Then no worries anymore, as one can remove duplicate configured account by adjusting sending/receiving settings, turn off the leave message on server in case of POP, try to clear the rules, disable antivirus app if installed any, in case data gets corrupted, recover it, and lastly, make use of automated tool to deduplicate Outlook mailbox messages. In this way, user can easily resolve the error “why I receive duplicate email in Outlook”.

All Outlook users should know that there could be many reasons for getting repeated messages continuously. Also, the problem of duplicate emails encountered in Outlook is faced by several users, making it a priority to resolve as it could affect the performance later if left unresolved.

So, in the article we will go through top seven ways and it can be used for Outlook 2021, 2019, 2016, or previous editions. The entire guide will help in fixing the error, providing safe and clean environment for future use.

Possible Common Reasons for Receiving Duplicate Email in Outlook

Before jumping to the solution, it is wise to understand the reasons first behind the occurrence of duplicate emails in Outlook. Some of them are listed here –

Wrong Account Configuration

 If the same account is setup multiple times, then there is a possibility that Outlook could have been downloading same message twice.

Clash of Email Rules and Filtering

Outlook sometimes put same email in multiple folders if filters are applied incorrectly which is causing conflict or overlap.

Antivirus or Firewall Installation

There is little security software that prevents the process of email synchronization, which can cause the issue of getting duplicate email messages in Outlook.

Sync Error in Microsoft Outlook

If there are any issues with sync between mail server and Outlook email client, especially while using IMAP or Exchange accounts, this could cause the error.

Corrupt Outlook PST File Database

In case PST file is corrupted, Outlook could face trouble with performance and data duplication especially if the file size is large.

These are some of the primary reasons causing error in Outlook. Let’s explore steps or methods that can help in resolving the issue.

Top Fixes to Prevent Receiving Duplicate Emails in Outlook

In the next segment, we will discuss the methods listed along with the advantages and drawbacks. Thereby, if you are contemplating on why I receive duplicate email in Outlook, then the mentioned fixes (manual and automated) could resolve the error and help in discarding the issue with ease. They are –

• Erase Duplicate Accounts
• Adjust the settings of Send/Receive
• Turn off the option “Leave Message on Server”
• Review Outlook Rules and Edit Accordingly
• Disable Antivirus Email Scanning Temporarily
• Fix Outlook Data Files
• Use Automated Solution

Method 1. Erase Duplicate Accounts

Sometimes, Outlook perceives same account as two separate ones possessing different mailboxes in case you have added it multiple times. Thus, Outlook constantly receiving duplicate emails. It is essential to remove them and to perform the same, follow the below steps –

1. Navigate to File, go to Account Settings and tap Account Settings again.
2. Check for accounts added multiple times and erase them accordingly.

Advantages

• The process is simple and useful.
• It prevents receiving duplicate emails in Outlook in future.

Limitations

• Risk of data loss.
• Copied emails that are already present will not be discarded.

Method 2. Adjust the Settings of Send/Receive

By implementing necessary changes in account settings of send/receive could help in fixing the error.

Follow the steps to adjust the settings of Send/Receive in Outlook

1. Tap Send/Receive option; click Send/Receive Groups, and last Send/Receive Groups.
2. Apply time gap of 10-15 minutes.
3. Disable unnecessary profiles.

Advantages

• Lower the chances of receiving duplicate emails in Outlook
• Make sure to have control over synced Outlook messages

Drawbacks

• In case duplicates are occurring from the server, then the method is not suitable.
• Email delivery could be delayed if the set time is very long.

Method 3. Turn Off the Option Leave Message on Server

1. Go to Account Settings, tap More Settings and hit Advanced.
2. Turn off by deselecting Leave Message on Server option.

Advantages

1. Make sure not to download unnecessary messages in MS Outlook.
2. Suitable for POP users who receive duplicate emails in Outlook frequently.

Drawbacks

1. Emails won’t appear on different devices.
2. Best for users who need to access emails from different platforms.

Method 4. Review Outlook Rules and Edit

If rules are not properly set up, then Outlook emails will be downloaded again. Follow the below steps to understand how to review and edit Outlook rules.

1. Navigate to Home tab, tap Rules and click Manage Rules and Alerts.
2. Check rules properly.
3. Erase unnecessary or wrong applied rules.

Advantages

• Erases unnecessary emails created by incorrect applied rules.
• Improves Outlook performance.

Drawbacks

• Time consuming process if several rules are applied.
• Users miss complex or advanced rules.

Method 5. Disable Antivirus Scanning Temporarily

If there is installation of third party, then it can prevent appropriate email scanning that cause duplicates in Outlook mailbox. So, it needs to be removed for some time. Follow the steps discussed below for the same –

1. Open Settings in Antivirus.
2. Click Turn Off option of email scanning.
3. Close Outlook and restart the same.

Advantages

• Easily operable.
• Simple method to prevent repetition caused during email scanning.

Drawbacks

• The process could lessen email security and privacy.
• It is temporary solution in case antivirus is not required.

Method 6. Fix Outlook Data Files

Outlook delivers in-built feature to restore damaged or corrupted Outlook data files i.e. Inbox Repair Tool.

Steps to Follow –

1. First, go to ScanPST.exe
2. Launch the same and select Outlook data files.
3. Last, recover all the issues.

Advantages

• Generally suitable to fix small corruption file errors.
• Helps improving overall Outlook performance.

Drawbacks

• Unable to fix severely damaged file.
• Data loss risk if not backed up.

How to Fix – Why I Receive Duplicate Email in Outlook?

Before applying the fixes, make sure to backup all the essential emails of Microsoft Outlook. This can be implemented by utilizing MacMister PST Converter for Mac & Windows. By making use the application, users can save Outlook data files into 15+ saving options such as PDF, EML, OLM, HTML, CSV, DOC, IMAP, Gmail, Yahoo, Office 365, and more. The GUI of the software is friendly and manageable. All technical and novice users can effortlessly operate it and execute the process easily.

The entire task will finish within seconds as the steps are minimum and easy to operate. Additionally, its powerful features enable users to implement the process according to the requirements. Besides, a freeware version will help users to explore the in-depth software processing for free.

Epilogue

In the write-up, we have discussed top fixes to resolve “why I receive duplicate email in Outlook”. Make sure to go through the pros and cons of every method and then implement the steps accordingly. Also, it is advised to use automated solution to save the backup of Outlook data files before applying the suitable approach.