good idea, not IMAP compatible Rated 1 out of 5 stars
The idea of the add-on is good, but I can't make use of the add-on because the add-on doesn't work for mails in IMAP mail folders. In my opinion, the subject-edit-window should be expanded.
Edit: Sorry, but the description has the wrong language. I can't read French. If I put your description into the Google translator, it says to me, that I can change incoming messages with the add-on and the changes occurs at the database-message.
Hi, try new version. In this one, changes could be locals only, or server-side IMAP compatible.