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Microsoft Exchange Online to Deprecate SMTP AUTH Basic Authentication for Tenants

Cybersecuritynews •Tushar Subhra Dutta • January 29, 2026

Microsoft is preparing a major security shift for cloud email customers as Exchange Online moves toward deprecating SMTP AUTH Basic Authentication for all tenants. The change targets one of the oldest and weakest ways to sign in to email systems, where usernames and passwords are sent in clear form that attackers can easily steal if […]

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