I (and I'm sure many of you) subscribe to daily digests from NANOG to keep things concentrated. However, there are sometimes messages in the digest I'd like to reply to, and I don't want to be that guy who just replies to the digest and opens an ugly new thread.

Curious what workflow/process any of you use to do so, and what the best/netizen-polite way is to end up with a reply that's appropriately threaded. Do I just need to mirror the subject line?