There's a new, apparently very useable, beta of Pimmy out. I've played around with Pimmy a bit in the past, and I can recommend it as a good little free email package. I also like Vivian, which is what I've been using with no problems over the last three or four months. This latest Pimmy implements mail filters, which Vivian also has. Both packages make multiple mail account usage very straightforward, which is a must in my opinion. In fact it's largely a question of what you like in an interface as to which of the two free mailers you'd prefer.