If you use e-mail at your business, consider adopting an e-mail policy. Establishing clear and comprehensive rules helps employees understand that e-mail should be used only for appropriate business
If you're on the fence about setting up an e-mail policy, consider the information in Should You Be Monitoring Your Employees' E-Mail and Internet Access?
Employees often consider e-mail informal, and may include comments that could come back to haunt the company. An employee might not think twice about sending a dirty joke to a coworker or using inappropriate language that may offend another employee.
Your e-mail policy should cover certain basic tenets:
Check out the sample E-Mail Policy on AllBusiness.