Rated 4 out of 5 stars

(Almost) perfect add-on :-) Thanks!! How can I add a date or datetime in the subject f.i. yymmdd or yymmdd hhmm, etc.

This review is for a previous version of the add-on (0.0.2). 

Thanks for the feedback. Actually this was requested in the joplin forum too and is already available upstream (https://github.com/marph91/thunderbird-joplin-export/issues/11). I will try to submit a release this week. Until that it's only possible to refer the default date by using "{{date}}" in the note title setting.