Opera Mail, even if no longer officially supported, is still cherished by users who appreciate having an uncomplicated means of managing their email. However, one ongoing headache that frustrates many Opera Mail users is that of duplicate emails, those needlessly repeated messages that crowd your inbox, complicate your conversation, and take up valuable space. If you find yourself in duplicates, this article will take you beyond the typical delete and move on. Let's find out what causes the duplicates in the first place, what mysterious settings contribute to them, and how you can totally wipe them from your inbox using both manual and smart methods.

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Why Opera Mail Creates Duplicate Emails

Before discussing remedies, it is essential to understand why duplicates arise in the first place. Opera Mail does not necessarily wake up one day and decide duplicate messages will show up—there is always a trigger.

1. Multiple Accounts Using the Same Mail Server
   If you have the same email address twice (e.g., a POP and an IMAP account for the same ID), Opera could be seeing them as separate sources and re-downloading the same messages.
2. Mess Up POP Server Settings
   If you are using POP server settings, very often the emails do stay on the server after downloading. So when Opera reconnects, it downloads those leftover messages, thus creating duplicates.
3. Interrupted Synchronization 
   If you log into the mail program and the Internet suddenly leaves during a mail sync, Opera may fetch messages again since it thinks they were never downloaded.
4. Corruption in Mail Database
   As time goes on, the Opera Mail database (M2 store) may sustain a minor level of corruption, which results in index errors that cause the same message to appear more than once.
5. Importing or Restoring Backups
   If you imported emails from a backup or from another system, there is a good chance that overlapping data will appear and create duplicate messages.

The Real Impact of Duplicate Emails

Some perceive duplicates as a simple nuisance. However, if you have used Opera Mail for any length of time, you understand how it can turn into significant performance issues.

• Inbox Confusion – A huge amount of duplicates can make it difficult to sort new or unread emails in your inbox.
• Storage Waste – Each duplicate takes up even more space in your profile folder.
• Sluggish Searches and Changes – When duplicates build up in your inbox, Opera's mail indexing can suffer in performance.
• Double your Backups – Each time you back up your data, you're making more duplicates!

In a nutshell, cleaning them is not optional; it is essential for smooth performance.

Manual Correction of Duplicate Emails:

If your Opera Mail program has only a few duplicates, it is possible to delete them manually with a little patience and care.

1. Use Filters and Views
   With Opera Mail, it is possible to create filters. You can filter your emails according to subject, sender, or date to physically verify which emails are duplicated. You can subsequently delete them by selecting the emails you are interested in by using Ctrl + Click or Shift + Click.

2. Rebuilding the Database
   Duplicates are not always actual emails; sometimes, the duplicates are accidental indexes. To deal with this:

   1. Close Opera Mail completely,
   2. Go to the Mail directory in the program data file
   3. Delete the indexer files (they will be recreated automatically.)

   When you open Opera Mail again, the emails will be correctly indexed again.

3. Check Server Settings
   If you use POP, click on Accounts → Properties → Incoming → Leave messages on the server. Uncheck it, or make sure it deletes downloaded messages. This setting prevents Opera from re-downloading the same emails again.
4. Remove Duplicate Accounts
   In Accounts → Manage Accounts, make sure that you didn’t include the same email twice (most users only use one email). If you add the same one, you may want to remove one of them.

These are manual fixes, which can help—but they’re not practical for large mailboxes or for continuous duplicate emails.

The Smart Way: Eliminate Duplicate Emails In Opera Mail

If you deal with thousands of emails, manual deletion will take ages and still leave traces behind. That’s where a specialized solution becomes invaluable. Then try the GainTools MBOX Duplicate Remover Tool. This software quickly finds duplicate MBOX files like emails and attachments and removes them without losing your original data. It will handle large duplicate MBOX files without the help of any other software. This tool supports all Windows OS versions, like 11, 10, 8.1, 8, and 7. This tool is best for non-technical users who don't have the technical knowledge. It has a simple UI. Users can use a free trial before buying this tool

Here's what makes it special

• Auto-Detects Duplicates: It will thoroughly scan your Opera Mail MBOX files for duplicates based on subject, from, to, date, and message body.
• Safe and Non-Destructive: It removes exact duplicates MBOX cleanly rather than potentially deleting the wrong things, and keeps your original data perfectly intact.
• Batch Processing: You can work on multiple MBOX files at once, which is great for people with larger, multiple Opera Mail profiles.
• Custom Options: You can choose to remove duplicates in each folder, or across all folders.
• Quick and Lightweight: It efficiently processes large duplicate MBOX files without crashing.
• Supportive: It will support all Windows OS versions without the help of email clients

With a couple of clicks, your Opera Mail data becomes organized, lean, and efficient again - no more duplicates - no more clutter.

Pro Tips for Keeping Opera Mail Clean:

The best way to stave off duplicates is to use a bit of prevention.

• Don't set up an email account more than once.
• Use IMAP instead of POP; IMAP syncs mail in real-time and does not re-download your messages.
• Regularly back up your MBOX files after cleaning.
• Use this as a maintenance step every couple of months.

In Summary

Although Opera Mail is an older program, it can still provide your email functional needs when set up correctly. Duplicate emails can sneak in through sync issues, a server misconfiguration, or even over time, but they don't need to sit there. Whether you're manually going to "clean up" minor clutter in your Opera Mail or you automate it with an auto-cleaning program like MBOX Duplicate Remover Tool, the aim is the same: a faster, more organized, clutter free experience of Opera Mail. Don't let duplicates ruin your computer's performance - clean smart, stay organized, and enjoy a more streamlined email platform.