For the most part, I want my outgoing messages saved in the Sent Mail folder as normal. However, there are a handful of people for whom I need ALL correspondence -- incoming and outgoing -- to be saved in its own folder. It's easy for me to set up a message filter that shunts their emails to me (incoming) into a unique folder. However, I cannot find a way to shunt my emails to them (outgoing) into that same folder. I've done this with other mail programs (Kmail was especially good with this sort of thing), but am stumped trying to figure out how Thunderbird handles this. What am I overlooking?