I won't even ask you to RTFM, but I'll ask you to start taking into consideration some rules of Netiquette... I'm going to quote some stuff from the Netiquette and comment.
Never send chain letters via electronic mail. Chain letters are forbidden on the Internet.
To give you an example, a couple of days ago a girl I know sent me a chain-letter with a picture of a little girl that is presumedly missing. Now, I don't even want to be rude on this, but if you think "poor girl, maybe she was kidnaped by some pedophiles!" think again: you're distributing a semi-naked picture of her on the net, and asking for others to do the same!
Use mixed case. UPPER CASE LOOKS AS IF YOU'RE SHOUTING.
It's particulary irritant when someone's asking me something (like a favour) via e-mail and doing it while shouting at me. You're not my boss, so calm down and ask politely.
Do not include control characters or non-ASCII attachments in messages unless they are MIME attachments or unless your mailer encodes these. If you send encoded messages make sure the recipient can decode them.
Yes, I include on this "do not send e-mails with attachments in propriatary formats".
Be brief without being overly terse. When replying to a message, include enough original material to be understood but no more. It is extremely bad form to simply reply to a message by including all the previous message: edit out all the irrelevant material.
Now, this is one of the most irritant things on e-mails people send nowadays, only beaten by...
If you are sending a reply to a message or a posting be sure you summarize the original at the top of the message, or include just enough text of the original to give a context. This will make sure readers understand when they start to read your response.
Yes, this means that you shouldn't reply with the answer in the beggining of the e-mail. People learn to read from top to bottom, and e-mail clients open e-mail messages from their beggining, not from the end. This means that people read the upper lines and then go down... What kind of sense makes a conversation like this?
Are you sure?
You must turn it off!
That problem must be solved.
On a final note... Even if you don't give a flying fuck about this issue, please use this guidelines when sending e-mails that might be read by me. You'll make my day-life less frustrating... ;-)