What are warning banners in corporate email?
Warning banners alert users to potentially risky messages. Common types: "External sender" alerts, "First-time sender" warnings, and flags for messages failing authentication or matching suspicious patterns.
Effectiveness: banners provide context at the moment of decision. Users seeing "External sender" on a message claiming to be from internal IT have information to question legitimacy.
Limitations: banner fatigue occurs if too many messages are flagged. Effectiveness depends on banners being meaningful and relatively rare. Tune policies to flag genuine risks, not routine external communication.
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