Short description of MailCOPA Email Client 9.01: MailCOPA, simply the best email client available. It is the most powerful out-of-the-box email client you can purchase to date. Not only is MailCOPA easy to use but it is pre-configured to aggressively combat SPAM and viruses and is fully multi-user and multi-machine capable allowing you to share email between users. In addition to being a great help to small and medium sized businesses, MailCOPA also has some great features for home users.