I'm at RailsCampX this weekend in Adelaide.
This morning I merged a whole bunch of pull requests into master and fixed some failing specs.
There are a few more fixes coming (we have upgraded to RSpec 2.0 to implement the eql method to remove many ruby warnings, this is in progress).
I plan to release a new version of Mail tomorrow, it will be 2.4.0 - minor version bump.
If anyone has any commits they would like in, please get pull requests in today.
Mikel