This function helps you take a hard copy of the message, provided that your device is connected to a printer, either directly or through a network connection.
The first way
Right-click the message which you want to print and click Print from the drop-down menu.
The second way
Tick the checkbox corresponding to the message, then click 
on the action bar.
The third way
Open the message, then click 
at the upper right corner of the message content and select Print from the drop-down menu.
You will be directed to the Print Preview page. Here, click Print to start printing.