topic Why Thunderbird is copying messages twice in sent folder? in Discussions

Why Thunderbird is copying messages twice in sent folder?

I_AM_CLULESS — Sat, 16 Sep 2023 12:41:48 GMT

For every message sent, Thunderbird is copying messages twice in sent folder. Just doesn't make sense.

Re: Why Thunderbird is copying messages twice in sent folder?

keesnl — Sun, 28 Jul 2024 19:16:16 GMT

The same for me now. How can I solve this?

Re: Why Thunderbird is copying messages twice in sent folder?

I_AM_CLULESS — Tue, 30 Jul 2024 11:32:55 GMT

Since no response and lack of support I uninstalled thunderbird and gone back to Outlook unfortunately!

Re: Why Thunderbird is copying messages twice in sent folder?

Agentvirtuel — Tue, 30 Jul 2024 12:31:11 GMT

Hello

As far as I am concerned, that's account IMAP Outlook

Take a look at https://forums.mozfr.org/viewtopic.php?f=4&t=139335

Copies & Folders panel https://support.mozilla.org/en-US/kb/configuration-options-accounts#w_copies-folders-panel
If, Place a copy in: box checked, then 2 messages in Sent1 message received

Copies & Folders panel
If, Place a copy in: box unchecked, then 1 message in Sent
1 message received

Re: Why Thunderbird is copying messages twice in sent folder?

Anonymous — Tue, 30 Jul 2024 18:34:52 GMT

Thanks.

Re: Why Thunderbird is copying messages twice in sent folder?

jartjazz — Sun, 01 Sep 2024 01:49:38 GMT

THUNDERBIRD, I just don't know what to do anymore, the messages repeated so many times? I need my drafts. I don't want to remove them, please can someone help? Thank you!!

Re: Why Thunderbird is copying messages twice in sent folder?

jartjazz — Sun, 01 Sep 2024 01:55:21 GMT

I need some help because this acc is very old and I need my emails save, please. I am not a computer expert.

Re: Why Thunderbird is copying messages twice in sent folder?

jartjazz — Sun, 01 Sep 2024 01:59:04 GMT

I wonder if anyone is here?

Re: Why Thunderbird is copying messages twice in sent folder?

Techinmay — Fri, 26 Jun 2026 10:44:54 GMT

Hey,

I recently ran into the same issue where Thunderbird sending duplicate emails or saving two copies of every email in the Sent folder. In my case, it turned out that both Thunderbird and the email server (such as Gmail or another IMAP service) were saving sent messages, which resulted in duplicates. This can also happen because of incorrect account settings, synchronization problems, multiple SMTP configurations, antivirus interference, or add-ons that affect the sending process.

To fix it, first check Account Settings > Copies & Folders in Thunderbird and make sure only one option is configured to save sent messages. If you're using an IMAP account, verify whether your email provider is already storing sent emails automatically. You can also repair the Sent folder, compact folders, disable unnecessary add-ons, and update Thunderbird to the latest version. Sometimes removing and re-adding the email account also resolves synchronization issues.

If your mailbox already contains thousands of duplicate emails, manually removing them can be very time-consuming. In that situation, I found the SysTools Thunderbird Duplicate Remover to be very helpful. It scans Thunderbird mailbox files, detects duplicate emails using multiple criteria such as subject, sender, recipient, date, message body, and attachments, and removes only the duplicate copies while keeping the original emails safe. It saved me a lot of time and cleaned up my mailbox without affecting any important data.