Gmail is one of the largest email service providers in the world. It has many options such as spam control, unlimited storage space, chat, labs etc. It give the option to make changes to how you view the message content in your inbox. This allows you to view the message in a horizontal or vertical split, so that you don’t have to open the message every time. You can also change settings to mark the message read without opening it.
Follow this step by step tutorial to learn How to preview the message content from your Gmail Inbox.