Insulting a persons on the net either knowingly or unknowingly. As the other person(s) can't see you, there is no scope for him to make out your mood. I.e. You should be aware that the other person can't see your facial expression , gestures etc., So, ther is a lot of chance for misunderstanding.

• ATTACHMENTS :

While sending attachments with mails, it is always a good nettiquette to mention the file size in brackets. For e.g. Attachments: XYZ (20Kb)

• SHOUTING :

Typing all your text in block letters is called as Shouting. Avoid shouting.

• SIGNATURE :

It is always a good nettiquette to attach a signature to your mails indicating your e-mail ID, Snail mail address and Telephone no.