Leave only the minimum necessary to provide context for your reply. Sending a list of email messages from a forwarded message header is especially annoying. Do not take personal gripes and issues with another subscriber to the list. Taking a gripe or issue with the listowner to the list is a really good way of getting yourself removed from the list permanently. It's ironic, really.
Computer networks bring people together who'd otherwise never meet.
Most of them would never act that way at work or at home. But the interposition of the machine seems to make it acceptable. Virginia Shea's Rules of Nettiquette Respect people's time and bandwidth. Some people have slow connections, or limited use of their mailboxes and limited space in them. Please refrain from sending email attachments to the list.