I found a really nice feature of Claws Mail. It's even documented, but I found it by accident.
It is good form when replying to an email to quote the material to which you are replying — and no more. With some mail readers, you hit reply, find the part you want to reply to, then trim everything else out of your reply.
Claws Mail has a neat feature to aid this process. Use your rodent to select the part you want to reply to. Then hit "reply" or "all", as appropriate. Claws will give you a nicely formatted and quoted excerpt, ready to go. And Claws even places the cursor after the quoted text, where it should be. Wow, what a concept.
This is a good example of how open source programmers and designers do it right where proprietary folks bungle it. Yes, you, Microsoft LookOut!, I'm looking at you.