Sending a message to a public discussion list has been compared to sending a letter to the editor of a newsletter. This is implicitly allowed, reasonable use of a mailing list and to the benefit of all list members. It does not mean that you lose copyright. Your message is not quoted out of context. It is possible to quote, or misquote, part of a message in such a way that it misleads people and damages the reputation of the original sender.
Attribution is given to the author.
The name of the original sender should always be acknowledged. Any appended copyright notice is respected.