Not working in V20 Rated 2 out of 5 stars
Also disappointed to find that this remarkably useful add-on seems to have been broken by the latest Beta V20.0b1 and that the developers seem no longer to be reachable :(This review is for a previous version of the add-on (0.7.4). This user has a previous review of this add-on.
Working on it
I'm aware of both MailRedirect being broken on Thunderbird Beta and the mailing list on mozdev being down. I'm working on a new version that is compatible with Thunderbird 20+ and I think I will move the mailing list to sourceforge, but I have problems migrating the history and subscribed users, since the page on mozdev is down.
Please have a bit of patience, since I was in the middle of rewriting MailRedirect and adding some new features, so I can't release an updated version just now.
If you really, really want it, you can mail me (Onno Ekker) and I can send you a snapshot ("nightly") of the current development version...