I have about the same experience, but with Thunderbird. Once I got my accounts set up in Sylpheed/Claws (I have used both) I found it did everything I needed, I

I have about the same experience, but with Thunderbird. Once I got my accounts set up in Sylpheed/Claws (I have used both) I found it did everything I needed, Its extremely stable has minimal dependency and uses negligible CPU and memory. I can compile Sylpheed form sources it in a few minutes on any recent version of Linux or BSD with little or no dependencies.