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MC786329 – Exchange Online to retire Basic Auth for Client Submission (SMTP AUTH)

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check before: 2024-05-10

Product:

Exchange, Microsoft 365 admin center

Platform:

Developer, Online, World tenant

Status:

Change type:

User impact, Admin impact, Retirement

Links:

Details:

Summary:
Exchange Online will retire Basic Auth for Client Submission (SMTP AUTH) in September 2025. Users must switch to OAuth or other alternatives before this date, as applications using Basic Auth will no longer be supported. Steps to prepare and alternative options are provided.

Details:
Today, we are announcing that Exchange Online will permanently remove support for Basic authentication with Client Submission (SMTP AUTH) in September 2025. After this time, applications and devices will no longer be able to use Basic auth as an authentication method and must use OAuth when using SMTP AUTH to send email.
Basic auth is a legacy authentication method that sends usernames and passwords in plain text over the network. This makes it vulnerable to credential theft, phishing, and brute force attacks. To improve the protection of our customers and their data, we are retiring Basic auth from Client Submission (SMTP AUTH) and encouraging customers to use modern authentication methods that are more secure.
[When this will happen:]
We will be making this change in September 2025.

Change Category:
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Scope:
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Release Phase:

Created:
2024-04-26

updated:
2024-04-26

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