Claws-mail is, IMHO, the best e-mail client. It has many possible configurations. Someone has written a program to facilitate its handling. This program is clawsker (https://www.claws-mail.org/clawsker.php). It is in the salix' repositories, both slapt-get and sbopkg, but don't run. It will probably be because the clawsker packages in the repositories are old (1.10 and 1.37), and does not combine well with the newest claws-mail (the latest version of clawsker is 1.4.1).
I've tried compiling the tar.xz file taken from its web, but it was a failure. Then I ask some gentle people to get a salix package of clawsker.
Thanks in advance.