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Forwarded attachments disappear after first IMAP draft save and subsequent saves fail with NS_ERROR_FILE_NOT_FOUND

Thunderbird Attachments
Lin replied
Ondřej Pilný
Ondřej Pilný

Thunderbird 152.0.1 (64-bit) Build ID: 20260630165458 Windows 11 IMAP account hosted by Wedos

I found what appears to be a reproducible bug when forwarding messages with attachments.

Steps to reproduce:

1. Open an email with a JPG attachment. 2. Click Forward. 3. Save the message as Draft (IMAP Drafts). 4. Without closing the compose window, save the draft again.

Result:

The second save always fails with:

"An error occurred attaching 20260520_123800.jpg. Please check whether you have access to the file."

Error Console shows:

Failed to fetch attachment NS_ERROR_FILE_NOT_FOUND url=file:///C:/Users/<user>/AppData/Local/Temp/nsmail-1.jpg

I also observed that after the first draft save Thunderbird deletes:

C:\Users\<user>\AppData\Local\Temp\nsmail-1.jpg

However, the compose window still references this deleted temporary file.

Additional observations:

- Creating a new message and attaching a file from disk works correctly. - Forwarding a message without attachments works correctly. - Removing the forwarded attachment and attaching the same file from disk also works correctly. - Closing and reopening the saved draft restores normal behavior.

This appears to be a bug where the compose window continues using a deleted temporary attachment instead of the attachment stored in the IMAP draft.

Can anyone reproduce this with Thunderbird 152.0.1?

Thunderbird 152.0.1 (64-bit) Build ID: 20260630165458 Windows 11 IMAP account hosted by Wedos I found what appears to be a reproducible bug when forwarding messages with attachments. Steps to reproduce: 1. Open an email with a JPG attachment. 2. Click Forward. 3. Save the message as Draft (IMAP Drafts). 4. Without closing the compose window, save the draft again. Result: The second save always fails with: "An error occurred attaching 20260520_123800.jpg. Please check whether you have access to the file." Error Console shows: Failed to fetch attachment NS_ERROR_FILE_NOT_FOUND url=file:///C:/Users/<user>/AppData/Local/Temp/nsmail-1.jpg I also observed that after the first draft save Thunderbird deletes: C:\Users\<user>\AppData\Local\Temp\nsmail-1.jpg However, the compose window still references this deleted temporary file. Additional observations: - Creating a new message and attaching a file from disk works correctly. - Forwarding a message without attachments works correctly. - Removing the forwarded attachment and attaching the same file from disk also works correctly. - Closing and reopening the saved draft restores normal behavior. This appears to be a bug where the compose window continues using a deleted temporary attachment instead of the attachment stored in the IMAP draft. Can anyone reproduce this with Thunderbird 152.0.1?

Semua Balasan (1)

Lin
Lin
  • Top 10 Contributor

Yes, I can confirm. I notice that when you save the draft the first time, the temporary copies of the attachments in Windows' %TEMP% directory are deleted, even though the Compose window is still open, which is why we get the file access error. If I close the Compose window and then later open the Draft copy for more editing or to Send, the temporary copies reappear in TEMP... but if I save as a draft again, the attachments disappear again.

It looks to me like it's related to the same bug that was discussed here:

https://support.mozilla.org/en-US/questions/1587025

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