Outlook Keep Sending Duplicate Emails

Outlook can send duplicate emails for a variety of reasons, including synchronization issues with Outlook and other email accounts, conflicts with add-ins and plugins, corrupted Outlook profile, and more. To prevent Outlook from sending duplicate emails, you’ll need to troubleshoot the issue and identify the cause. Some steps you can take include disabling add-ins, running the Outlook Inbox Repair Tool, and resetting the Outlook profile.