The program that actually distributes the mailings is called Majordomo. It lives at listlink.berkeley.edu . This is mostly all you will care about.
Posting is easy.
What happens when you reply to a message has caused some consternation. I have therefore written a thorough explanation in 1.1 of the reply mechanism, which should be useful in other contexts. How to Post To post to the list, you must first be a member of the list. Any email you receive will always have some information associated with it, such as who sent the letter and when, what its subject is, etc. Some of this information is made visible to you by your mail program in the form of headers.