The naming format for saving as plain text is the same as for html format. Filenames can be configured with the ImportExportTools NG add-on. For TB 91, v. 11.0 is available here:

https://github.com/thundernest/import-export-tools-ng/releases/tag/v11.0

Sorry, maybe I was not clear enough. The HTML that is saved is now different and does not include the mail header information - subject, date and sender - in the old format. As I store that information in a database I wish to be able to access it through code I have written.

The way it is stored if I request a text version seems to be the same - or at least my software can cope with it!

Thanks.

OK, I see that the html version doesn't show the headers, but the plain text or eml versions do. The add-on only allows the header information to be included in the file name, plus other options such as exporting an index.

I am also having the same problem from TB version 91.0.1. Messages saved as either htm or eml are missing header information in saved document. File name is not the issue, apart from saving htm extension to specify file type.

I am also having this problem. I took me a while to find this post that addressed this issue. I am using TB 91.2.1. I am not using any add-ons that I am aware of when I save the file.

Saving the file as text does include the header info. Saving the file as .eml and viewing that file with a text editor shows that the headers are in the file. A Thunderbird developer must have changed Thunderbird code that used to put the headers in .html files. All we have to do is to get that developer to own up to the change.

I am being plagued by the crapification of all sorts of software this week. I am tired of hearing the excuse that this is a feature, not a bug.

I also have this problem, running TB 91.3.2. TB changed the Save As feature so that when saving to HTML, it no longer includes header information -- the date, subject, from, and to fields. This is a significant problem, and it's been reported for over a month. Please fix this!

The header information is included by ImportExportTools NG: right-click, Save selected messages, HTML format (with or without attachments).

https://addons.thunderbird.net/en-US/thunderbird/addon/importexporttools-ng/

I have learned to save it both as HTML and text. Then I use an editor to get the missing info from the text file and putting it into the HTML file. The HTML file is a bit of a mess, so I have to straighten it out to make my additions work.

Looks like this got fixed in version version 91.4.1, dated 2021-12-17. Save as HTML now saves the headers. Thanks.