I would really like to be able to add a note to my emails. As of right now I just leave them unread until they have been follow through with or are completed but being able to add notes would help me keep track so much better. Example notes: Already forwarded to the accountant. Waiting for P&L Report to attach. #thunderbird#
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Have you tried tags for short status. like important personal etc.
On the message menu underv tags
X-Notes is available as an add-on under Tools/Add ons and Themes.
Think this is what you want.
I have long wanted something like this and recently found an extension called QNote that enables it. I do use it. Apparently from what others are saying there is also one called XNote.