Someone else will. Instead, help them out by sending advice to their personal mail address - not to the list. By convention, e-mail addresses are usually typed in all lower case. When used with a shortened word, it marks an abbreviation. When used with money, it marks the cents position.
Some addresses are shorter than others.
The last section of the address tells you something about the computer the sender is using. When you send mail to someone else on the same computer, you only need to use the person's username. This is a very complete explanation of e-mail and its conventions. Finally, Wired magazine had a short-lived Netiquette column in early 1995. You can consult the back issues.