e-mail mistakes that make you look bad

This will give you some email attitude! Don't think you are anonymous when sending emails, you can be followed up by checking the header part of your email, Sending email to the wrong person in your address book can be another disgrace! Forgetting the attachment, using your personal email account instead of business account and clicking the send button to fast and ... You'd better check it yourself:
8 e-mail mistakes that make you look bad