According to Gartner, "Email is the most commonly used attack vector in targeted and untargeted attacks."
Large-scale migration of email to the cloud has necessitated a strategic shift in how to secure this communication channel. Security and risk management leads must adopt a continuous adaptive risk and trust assessment mindest to protect inboxes from exposure to increasingly sophisticated threats.
According to Gartner" Impersonation and account takeover attacks are increasing and causing direct financial loss, because users place too much trust in the identities associated with incoming email and are inherently vulnerable to deception and social engineering."
Read this Gartner report, Market Guide to Email Security, for key findings and recommendations.
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Gartner Report, Market Guide for Email Security, Neil Wynne and Peter Firstbrook, 6 June 2019