Email is a terrible way to communicate. There are multiple studies showing about 50% of all emails are misinterpreted. My experience and your experience probably support that fact.
I have received angry emails from my customers, my peers and my leaders through the years. They can make me both angry and frustrated. Unfortunately, the way I choose to respond to those emails usually escalates the emotions involved.
We all have a choice in how we respond to these messages.
I have reposted this from December 2012 due to recent questions from some clients on effective communication.