Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
Open

ERROR WHEN EXPORTING WITH NG

nous24

I am using Thunderbird as email client on Win 10. When trying to backup old messages I am getting en error message as below. I tried several ways exporting emails as “eml”, PDF’s or even plain text, but all the same. Following error message:


[Exception... "Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)" location: "JS frame :: chrome://mboximport/content/mboximport/utils.js :: getSubjectForHdr :: line 186" data: no]

Exporting: Folder: Inbox Msg: Undelivered Mail Returned to Sender

getSubjectForHdr@chrome://mboximport/content/mboximport/utils.js:186:26 onAfterStopRequest@chrome://mboximport/content/mboximport/exportTools.js:1809:14 onStopRequest@chrome://mboximport/content/mboximport/exportTools.js:1743:28

Can anyone assist?

I am using Thunderbird as email client on Win 10. When trying to backup old messages I am getting en error message as below. I tried several ways exporting emails as “eml”, PDF’s or even plain text, but all the same. Following error message: [Exception... "Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)" location: "JS frame :: chrome://mboximport/content/mboximport/utils.js :: getSubjectForHdr :: line 186" data: no] Exporting: Folder: Inbox Msg: Undelivered Mail Returned to Sender getSubjectForHdr@chrome://mboximport/content/mboximport/utils.js:186:26 onAfterStopRequest@chrome://mboximport/content/mboximport/exportTools.js:1809:14 onStopRequest@chrome://mboximport/content/mboximport/exportTools.js:1743:28 Can anyone assist?

All Replies (1)

This would be an ImportExportTools NG issue, not Thunderbird's. Their support site is at

https://github.com/thunderbird/import-export-tools-ng/issues

I see a couple issues that remind me of yours, so maybe it's a known problem that they're working on:

https://github.com/thunderbird/import-export-tools-ng/issues/898

and

https://github.com/thunderbird/import-export-tools-ng/issues/915

I do see one thing that you can try. Your error message mentions what looks like a message that has the subject "Undelivered Mail Returned to Sender". Maybe that messages is malformed or otherwise has something about it that ImportExportTools NG doesn't like. If you can find that message in the Inbox and delete it, then Compact the folder, maybe the export will work normally.

Still et spørsmål

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.