We are all guilty of some of these points at one moment or another, but remembering to step back and think about the impression we are making is often a good idea.

1.     Understand the difference between “To” and “CC.”
2.     Keep messages brief and to the point.
3.     Don’t discuss multiple subjects in a single message.
4.     Reply in a timely manner.
5.     Be mindful of your tone.
6.     Don’t use email to criticize others.
7.     Don’t reply in anger. It almost never serves your purpose or long-term interests.
8.     Don’t overuse “reply to all.”
9.     Don’t forward chain letters.
10.     Don’t “copy up” as a means of coercion.
11.     Don’t overuse the “high priority” flag.
12.     Don’t write in ALL CAPS.
13.     Don’t send or forward emails containing libelous, defamatory, offensive, racist or obscene remarks.
14.     Remember that company email isn’t private.
15.     Remember that company email isn’t private.
16.     Use a signature with your contact information.
17.     Provide “if-then” options.
18.     Use your spell-checker.
19.     Re-read your email before you send it.

Read the original article for the full reasoning behind these tips by Michael Hyatt.