There is a copyright issue involved here. Some discussion lists claim copyright on all messages, and some individual contributors consider that they own the copyright on their messages to discussion lists. It would be wise to find out the policy of any list whose messages you want to quote, and it would be both courteous and smart (as in CYA) to contact anyone whose message you want to quote and ask for permission. Most of us would probably be flattered at the idea, but safe is better than sorry.
Ruth E. "I can write about anything!" (tm) Thaler-Carter, Writer/Editor
Author/Publisher, "Get Paid to Write! Getting Started as a Freelance Writer"