Rated 4 out of 5 stars

It works with Supernova using context menu but:
- using same thunderbird from 2 different computer with this plugin installed on both and accessing the same IMAP account , redirected emails are not maked as redirected on both ( only on the one who made the redirection)
- redirected emails are not stored in sent folder.

I defined a new tag "redirected" but it doesn't applied automatically and is not visible on the other pc even if I created the same tag on it

- define a tag 'redirected'
- there is a checkbox 'Save this message'