In an effort to assist users with identifying emails from external sources that might pretend to be from a trusted, internal source, UDIT has added some new visual indicators to Outlook emails as of July 3, 2024. Gmail users already had an indicator, but now Outlook users have one, too.
Below are screenshots of the new indicators in Outlook 365 web, desktop, and mobile applications.
Outlook 365 Web
Outlook Desktop Client
iOS Mobile Devices