Below are screen shots of sample Locky ransomware emails. For a better view, click the image here, or go to the FireEye article at https://www.fireeye.com/blog/threat-research/2016/08/locky_ransomwaredis.html.
Any time you receive an email from anyone that contains an attachment or links, stop and take your hands off your mouse and keyboard. You do not want to click anything that is even remotely suspicious or unexpected. When in doubt, delete.
For more information, see "Locky" ransomeware - what you need to know.