A Claws port is up in extras-devel, Lucas Maneos is the maintainer. I've messed with it a little, seems functional. Could use a lot of work to make it more finger friendly for at least common day to day emailing tasks. Claws Mail would be feature complete enough for more people I would imagine.

There isn't much info I can find on it online so I'm not sure how far he intends to take the project or if he would be interested in some help. If you've got the skills/time to contribute and are interested I'd get in touch with him.