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Microsoft Exchange Online to Deprecate SMTP AUTH Basic Authentication

First seen 29 Jan 2026, 12:48 UTC • •

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ThreatCluster •March 12, 2026 at 13:27 UTC

Microsoft is set to deprecate SMTP AUTH Basic Authentication for all Exchange Online tenants. This change addresses security vulnerabilities associated with sending usernames and passwords in clear text, which can be easily intercepted by attackers.

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