I've test both "sylpheed" and "claws" and I'm not so impressed by "claws" While having the accounts settings on both I'm not able to send mail with "claws" (smtp errors) the accounts need authentification.
Other flaws: - if I set the first account while off line after switching on line I get a message about corrupted mailbox and the only way to get ride off it is to remove the directory ".claws-mail" in "/home/user"
- when composing a message the "To" field is behind the on-screen keyboard making hard to correct typing errors
So I wiil stick to "sylpheed" hoping it will not disapears to the benefit of "claws"
I'm from France and I own a N800 for 2 months (1st experience with tablet)