See the screenshot above? The images were blocked by default. I used to get pissed off when i receive an email then it doesn’t display images unless i click on a “show images” link. I didn’t know why this was happening until i got it figured. It is actually a good thing on our end because when you click a message to allow the images to display, you are informing the sender that you read their email. Spammers use this technique to determine if a real person opens the email that they sent; that’s why email programs default to not showing you images unless or until you tell the program otherwise. This is not 100% guarantee method but it works to some extent.
Before you click that show images link, make sure you know where the email came from. It is just a simple safety issue.