In short: please don't. Slightly longer: Please do not intentionally add anyone (or any other list) via the CC field when posting to the list.
Why? Read on: We generally have not allowed multiple recipients on O-list postings in order to stop cross-posting between lists (makes for unwieldy conversations) and to stop people from mass-CC'ing a ton of people on a post (potentially exposing their addresses to the public list without their consent). We've had to very-slightly-relax this requirement to allow the *author* of a post to be copied on a reply, which sometimes happens automatically due to a complicated side effect of some modern email security settings. So while you may sometimes see a list posting whose "To:" field looks like this: To: <someuser@...>, <origami@lists.digitalorigami.com> You should not, generally, see - nor, more importantly, *try to create* - one that is of the form: To: <origami@lists.digitalorigami.com> CC: <someotheruser@...> with or without an extra person on the "To" field. I've just let one through that has someone CC'd, but they're already on the thread, so there is no particular harm in it, and it was easier to approve than have the author re-write it. But if you add someone to the CC field, it will likely cause the admins to have to approve the message, which delays your message, and is more work for us, neither of which is optimal. :) So, go fold something, come back and tell us, eschew CC'ing, &c. Anne