In case of misuse, the message can be traced to the real sender anyway. Always use your own name and email address when sending email. It is possible to send file attachments through email. Before you start sending any, it's best to know what may be attached, how, and when you should do it - and when not. An attachment is much more space-consuming than a normal email message.
Attachments are a strain on the mail server and they can quickly fill the email disk.
If you send a message to several people, the attachment file is copied to every one of them, which of course multiplies the load on the server. Since attachment files can also be executable programs, they are an ideal way to get a virus infection. If you get an attachment from an unfamiliar address, or even one from somebody you know but weren't specifically expecting to send you one, make sure to check the file for viruses first, or even better, ask for confirmation from the sender that the file really is from him and that it is safe to use. Suspicious attachments might just as well be deleted outright. Pine is a safe program to use in this regard.