Click Tools > Options and select the security tab, is there a tick in the box beside Block images and other external content in HTML e-mail?
If there is a tick remove it and see what the result is.
Surface Pro 5 News - release date, UK price, features, specs
Gear VR vs. Daydream: Which delivers the best VR experience?
Best Mac antivirus 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.