Only very important or urgent news items should be posted directly to the list. Messages with attached files should never be sent to the list . Many list members have email accounts on university systems with limited storage space allocated and no easy way to extract attached messages. Additionally, attachments carry serious virus risks. This is useful practice, in moderation, but please do not quote excessive quantities of text in this manner.
People can always refer to the original message on the list archive.
Obviously, you must obey copyright and other laws. Messages which are rude or irrelevant must not be posted to the list. Offenders may be barred from the list and their messages removed from the archive. Please note that the list archiving system will notice whether a message you send to the list is a reply to previous message or a completely new message, and file the message in the appropriate 'thread' of discussion. So it is better not to use 'reply' if your message is unrelated to the message you are replying to, even if you don't include any of the original message.