Security News > 2021 > March > Microsoft 365 adds 'External' email tags for increased security
Microsoft is working on boosting Exchange Online phishing protection capabilities by adding support for external email message tags to its cloud-based email service.
"This will be achieved by presenting a new tag on emails called 'External' in the message list," Microsoft explains in the Microsoft 365 roadmap.
The new external email tags will only show up in Outlook on the web, the new Outlook for Mac, and Outlook mobile.
After its rollout to all Office 365 environments to standard multi-tenants worldwide later this month, the Exchange Online external tag feature will be off by default.
"If you enable the cmdlet, within 24-48 hours, your users will start seeing a warning tag in email messages received from external sources," Microsoft says.
Last year, Exchange Online added support for plus addressing, allowing Office 365 customers to use unlimited disposable recipient email addresses to filter and track email sources.
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