Hi,
this is a reply to: https://lists.torproject.org/pipermail/tor-dev/2011-April/002551.html (I was not on the list at that point in time.)
I wanted to let you know that I'm also researching in this area, but my goal is not to build an extension and I'm not involved in GsoC.
I'm looking into issues that would negatively affect the pseudonymous use of Thunderbird with Tor. (Application level concerns when using Thunderbird with Tor) As a side effect I'm also playing around with Thunderbird/Lanikai.
The outcome of my research (~08/2011) is hopefully useful to those actually implementing stuff.
best regards, tagnaq