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Microsoft Exchange Online to End Support for SMTP AUTH Basic Authentication

Microsoft has revised the deprecation timeline for SMTP AUTH Basic Authentication in Exchange Online. This update provides organizations with an extended period to modernize their legacy email workflows.

HBy Heather LyonsJan 28, 20262 min read

Microsoft has revised the deprecation timeline for SMTP AUTH Basic Authentication in Exchange Online. This update provides organizations with an extended period to modernize their legacy email workflows.

The updated schedule has been established to address customer feedback and adoption challenges, offering clearer milestones through 2027. Until December 2026, SMTP AUTH Basic Authentication will continue without changes for existing tenants. By the end of December 2026, the authentication method will be turned off by default, although administrators will have the option to temporarily re-enable it if necessary for business continuity.

After December 2026, SMTP AUTH Basic Authentication will be unavailable by default, with OAuth being the only supported authentication method. Microsoft plans to announce the final removal date in the second half of 2027, marking the end of basic authentication for client submission endpoints, including smtp.office365.com and smtp-legacy.office365.com.

Basic authentication presents security risks by transmitting usernames and passwords in plain text, which can lead to credential theft and phishing attacks. This method also prevents the enforcement of multifactor authentication (MFA), leaving email systems susceptible to unauthorized access.

Microsoft has revised the deprecation timeline for SMTP AUTH Basic Authentication in Exchange Online.
Heather Lyons · Thehackingpost

Microsoft's initiative to eliminate basic authentication from Exchange Online began in 2019 and was mostly completed by late 2022, with SMTP AUTH being the exception. Once disabled, applications attempting basic authentication will encounter the error: "550 5.7.30 Basic authentication is not supported for Client Submission".

Organizations should prioritize migrating to OAuth, a token-based authorization method. OAuth 2.0 access tokens are specific to designated applications and resources, preventing credential reuse and enabling effective MFA enforcement.

For organizations that require continued basic authentication functionality, alternatives include High Volume Email for Microsoft 365, Azure Communication Services Email, or Exchange Server on-premises in hybrid configurations with anonymous relay connectors.

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Administrators are advised to inventory current SMTP implementations, identify OAuth-compatible clients, and develop migration plans before the default disable date in December 2026. The Exchange admin center now provides SMTP AUTH Clients Submission Reports, offering insights into tenant authentication patterns.

The extended timeline aims to balance security imperatives with operational needs, allowing customers ample time to validate modern authentication alternatives while reinforcing Microsoft's commitment to stronger security postures in Exchange Online.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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