Avoid writing e-mail or posting messages in blogs, newsgroups, forums, chat rooms and other online venues using all capital letters. IT LOOKS LIKE YOU'RE SHOUTING! Not only that, it's difficult to read
· Don’t use e-mail as an excuse to avoid personal contact
· Asking a stranger to become your friend without a proper introduction is generally discouraged. If you want that person to join your network, explain the reason and who you are.
· Many people now receive e-mail on mobile phones and other portable devices. Tiny screens make reading e-mail challenging.