Business communication has evolved to rely heavily on eMail. It is a “killer application” of the internet. As a tool, it is as effective as the person using it. As a business owner or manager, you should establish guidelines that your company abides by to ensure proper use of this tool and that it does not potentially harm the corporate image.
If you have not done so yet, please see this article about establishing an appropriate use policy for your company in regards to technology use in the workplace. Additionally, there are certain percautions and best practices for using eMail effectively. The article in this link provides an excellent list of email tips for business communication. Finally, be sure to read this article with a list of 10 golden rules of email etiquette.