Write DO or DON´T in the blanks

Always greet your correspondent
Start your message in the subject field
Overuse acronyms; you may not be understood
Wait a day, if possible, before answering
Forward e-mails without getting the author´s permission first
Re-read before sending
Think before you write
Write anything you wouldn´t put on a postcard
If you are angry, wait even longer
Be brief
Write in capital letters; it will be perceived as shouting
Think creatively about your subject line
Use upper and lower case
Use e-mail as a weapon or to conduct difficult conversations
Spell and punctuate properly
Sign off simply
Be negative