If you are seeing duplicate emails in a folder, it can be frustrating and make it difficult to manage your inbox. Here are some potential causes of duplicate emails and how to address them:
Syncing Issues: Sometimes duplicate emails can occur if there is an issue with syncing your email account with your email client. To address this, try closing and reopening your email client, or restarting your device. You can also try manually syncing your email account to see if that resolves the issue.
Rules and Filters: If you have rules and filters set up to move emails to specific folders, duplicate emails can occur if these rules are applied multiple times. To address this, check your rules and filters to ensure that they are not causing the duplicate emails. You may need to adjust your rules or remove them altogether.
Email Client Settings: Your email client may be configured to download messages more than once, which can cause duplicates to appear. To address this, check your email client settings and ensure that it is only downloading messages once.
Server Settings: Duplicate emails can also occur if there is a setting on the email server that is causing the duplication. Check with your email provider to see if there are any server settings that could be causing the issue.
Corruption in PST or OST files: Duplicate emails can also be caused by corruption in the PST or OST files, which are the files that store your email data on your computer. To address this, you can try repairing the PST or OST files using the built-in repair tool in your email client.