To remove duplicate emails while migrating an IMAP mailbox, use a migration tool with a built-in duplicate removal feature instead of manually identifying repeated messages. SysInfo IMAP Backup Tool includes an advanced deduplication option that compares email details such as the subject, sender, recipient, and message body to identify duplicate emails during the migration process. After connecting your IMAP account, select the required folders and output format, enable the duplicate removal option, and start the migration. The tool can also preserve the original folder hierarchy, attachments, timestamps, and other email metadata while exporting the required data. For large or repeated migration jobs, its incremental migration feature can skip previously migrated emails and reduce unnecessary duplication. This makes SysInfo IMAP Backup Tool a practical option for keeping the migrated mailbox clean and organized while minimizing repeated messages and manual effort.
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