JungleMail for Office 365 | How to let images in your campaigns load automatically?
How to have the images in your sent campaigns load automatically?
If you are sending emails inside of your organization you could add the JungleMail From address/domain to a Safe Senders list for everyone working in your company. This will enable the automatic downloading of images for the domain you specified.
The way to do this for your entire company is by using the Group Policy Management Console. Microsoft has a good tutorial in which they explain how you can achieve this. You can find the detailed instructions for doing this on Microsoft's tutorial website.