I send and receive numerous emails a week, and most of them a very effective emails, but some of them take way too long to read. One of my teachers sends very effective emails, and most of them do not exceed more than 20 words. In one of them he was informing us about an upcoming test and how we should prepare for it, and did so in a very effective way. In two sentences he told us that he was cancelling our quiz due to the snow days and what we would need to review for the test. Additionally, he told us the format of the test and ended the email very professionally.
This same teacher has also sent some ineffective emails like when he was reminding us we had a development day and sent us all an email that only contained 5 words. Those words were see you in eight days, which was a clever way to remind us we did not have class, but it could have confused some people reading the email. Although less words is effective, sometimes it is better to have some more descriptive words in an email.
Another one of my teachers sends many emails to us every week, and most of them are very effective but some confuse me and do not have enough info to help me. An effective email he sent us was explaining how to access the website where we would be completing out homework. The email was a little long, but it contained all the necessary information to walk you through setting up the service. He included useful info such as the website we needed to go to and some troubleshooting for issues we could have.
An ineffective email he sent was when I was trying to set up an office appointment with him for the first time. My email to him was very effective as it short and concisely explained why I was making this appointment and when I wanted to make it for. His response was not a very effective email as it was only 10 words long and only included him saying yes and what time he would be in his office. He did not include where his office was or if I needed to bring anything, this caused me to have to send another email to him to get this information.