[jenny91]

What about responding inline to parts of a message?

[gjsman-1000]

We do it like Hacker News. It's just another message, with > indicators. Globally, inline replies are A. Rare and B. Often used with prank intent (i.e. you can make it look like you're replying to something they didn't say).

[gray_-_wolf]

Not sure about globally, but on most mailing lists I read they are used quite often.