If you use a recent version of mail program you can filter these messages into a separate folder in case you want to keep them separate from other emails. Its a fairly painless procedure. Even though you may have access to the latest you-beaut email package that can send file attachments in various guises, other people may not and so they just receve a whole bunch of binary characters. Please just type your message, DON'T send attachments. In fact, with this version of software attachments will be stripped from your message.
Plain text is preferable.
If it is a personal reply check that it is not being sent to everyone on the list if you do not intend that. Please take care when replying to messages that you do not copy back to the list entire copies of other emails. Please try to summarise the prvious message of just cut out the section you are referring to. These are part of internet folklore and are usually false and somebody, somewhere is having a chuckle at your expense. A check will then be made to ensure that you are a current financial member.