Starting June 15th around 10:30 am PST, all images in CC eblasts are broken links in Microsoft Office 365 Outlook and web app. After multiple sessions with CC Support and hours of internal testing. The problem appears to occur only with current versions of Chromium browsers (Google Chrome, Microsoft Edge Chromium, Opera, etc). Older versions of Google Chrome, and Firefox don't seem to have the problem. Microsoft Outlook uses the web browser engine to render e-mails, so the image are broken inside Outlook as well as on the web app. Mobile versions of Outlook aren't affected as they use a different browser engine to display the e-mail.
The issue does not occur through other email service providers. Is there a code update that CC needs to make or has CC looked into the issue with Microsoft to resolve? If we have to tell our clients to only view emails via mobile devices or using a web app in Firefox, we will need to change email service providers.
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