Delivery Trust customers with an email service hosted by Google (G Suite) and utilizing the G Suite Sync for Microsoft Outlook tool version 184.108.40.206 or greater causes Outlook to crash when launched.
An installation of the Delivery Trust for Outlook add-in version 220.127.116.11 and an installation of G Suite Sync for Microsoft Outlook version 18.104.22.168 or greater will result in Microsoft Outlook crashing on startup.
This issue only appears to be affecting customers with the Delivery Trust add-in for Microsoft Outlook version 22.214.171.124 and G Suite Sync for Microsoft Outlook version 126.96.36.199. Customers with an earlier version of the G Suite tool do not appear to be affected.
Workaround: The only action that can be taken at this time is to either disabled the Delivery Trust add-in and work within the web portal when you need to act upon and/or create secure mail messages. Alternatively, the G Suite tool can be uninstalled, though this may result in reduced functionality with regard to what aspects of your G Suite service can be managed within Outlook.
STATUS - OPEN
This issue is currently with the DEV team who are working to modify the behavior of how the Delivery Trust for Outlook add-in behaves alongside the G Suite Sync for Microsoft Outlook tool.