Does anyone subscribe to the thunderbird dev list?
Would someone be interested in subscribing and seeing if they can drum up interest in helping with the thunderbird part of the plumbing to put hashcash suppport into thunderbird? (Or create a patch to do that). Presumably this could be done via hashcash library, or just direct - its fairly simple given access to a SHA1 library, key value store (like berkely db etc), and mail parsing library that thunderbird will have. Seems likemost ingredients are already in thunderbird.
Adam