How to open an email message in RoundCube This tutorial assumes that you've already logged in to RoundCube webmail. Now let's learn how to open an email message so we can read it, and perhaps respond to or forward it. When you first login to RoundCube, you'll see that the Inbox is highlighted... ....which means the messages shown here are in the Inbox. To open an email message simply double click on the email itself. To view the messages in any of the other folders, select the folders accordingly..... Then double click on the email that you want to see. This is the end of the tutorial. You now know how to open email messages from any folder.