keep it short and sweet - it's not an essay
check your spelling, grammar and punctuation
use complete sentences, not "u r great"
not everybody can get fancy fonts and colored backgrounds - keep it simple (text is best).
writing everything in CAPS is considered shouting - use it only for emphasis
always include a meaningful subject; don't leave it blank
when sending attachments, you may want to let the recipient know before you send them
do not send large attachments - they can freeze or slow down the person's e-mail program
check your information so that you don't pass on hoaxes (see Checking for Hoaxes)
do not pass on chain letters that promise rewards for sending it to others or punishment for not
if you are replying to a previous e-mail, include some of the previous text, however don't include anything that isn't necessary
if you are forwarding information, remove the name(s) of the other people
if you are sending an e-mail to a group, use the Bcc (Blind carbon copy) option so that the e-mails remain private

E-Mail Etiquette