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.

external sender notification

Outlook 365 Web

Outlook 365 web external notification

Outlook Desktop Client

Outlook Desktop Client external notification

iOS Mobile Devices