Well, if you are a corporate netizen or if you are simply writing an email on behalf of your company, you better be sure that you are in sync with the standards of writing email. This article discusses this issue at length, Do you have mail etiquettes?:

Since emails comprise the bulk of communication, email etiquette has gained importance as it ensures professionalism, efficiency and helps in maintaining a proper record. So here are a few tips that can help you escape those communication troubles.