To unblock picture downloads for all messages in Outlook 2016:
Click Trust Center.
Under Microsoft Outlook Trust Center, click Trust Center Settings.
Uncheck the Don’t download pictures automatically in HTML e-mail messages or RSS items check box.
If this doesn’t resolve your issue, check if you have text only emails enabled:
Click Trust Center Settings.
Click E-mail Security.
Under Read as Plain Text, make sure that the Read all standard mail in plain text is unchecked.
To display images for individual emails:
Select Trust Center.
Select Automatic Download.
Uncheck the “Don’t download pictures automatically in HTML e-mail messages or RSS items” checkbox.
Another way to ensure that images download is to ensure that the sender is on your safe sender list.
To add a contact to your safe sender list:
Click on Tools > Options.
On the Preferences tab, click on the Junk E-mail button.
Click on the tab for Safe Senders.
Click Add to add the email to the list.
Click OK to exit this window.
Click OK to close out of the Options menu.
To display images for all emails:
Click the File > Options.
Click Trust Center.
Click the Trust Center Settings button.
Uncheck the box next to the “Don’t download pictures automatically in HTML e-mail messages or RSS items” option.
For additional assistance with images in Outlook 2010, please see Microsoft Support.
Outlook 2007, 2010, and 2013 – Secure Images
Internet Explorer has a security setting that, when enabled, prevents Outlook from displaying images with a secure URL. (Image URLs starting with “http” will display, not URLs that start with “https”.)
If Outlook 2007, 2010, or 2013 displays some – but not all – images, you may need to change the setting in your Internet Explorer web browser or desktop software.
To change the setting in Internet Explorer:
Open Internet Explorer.
Go to Tools > Internet Options.
Click the Advanced tab.
Scroll down to the Security settings list, then uncheck the “Do not save encrypted pages to disk” option.
Before the changes take effect, it may sometimes be necessary to clear the cache in Internet Explorer and close Outlook (File > Exit to close fully). After relaunching Outlook, send yourself another email with an image that did not display previously.