This has come up as a request from users a few times, but it finally made it to the top of the todo list (and I kinda need it for the site migration I’m in the midst of)…you should now be able to reply to forum topics via email. Just be sure to use the reply-to-list (or whatever) feature of your mail client, and the To address should look something like
firstname.lastname@example.org which will find its way to the right topic. You also must use the exact email address on your account, otherwise it will bounce.
I am not enabling topic creation via email, due to spam concerns. You’ll still have to come to the forum to start a topic. The reply-to function has a built-in secure hash, so it is much less risky.
Let me know if you run into any problems with it.