You are using a computer, not talking to one. For external messages, say hello at the start of your message and goodbye at the end.
Internal messages can be more direct.
Use MS Word to send official college email messages within the College. Notify Campus Network Services if your computer does not have a working copy of Word. Use your spell checker and grammar checker before sending an email message. Words and text typed in capital letters are considered impolite. They are interpreted as yelling or shouting.