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Microsoft switches off Basic Authentication for SMTP
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Tag: SMTP authentication
SMTP authentication refers to the secure login of an email client or a system to an SMTP server for sending emails. Modern authentication methods such as OAuth2 are replacing the outdated “Basic Authentication”, as they are much more secure and increase protection against password theft and misuse. Here you will find articles on secure setup, Microsoft’s changes and optimal SMTP usage with Microsoft 365.
Explanation of the term “SMTP authentication”
SMTP stands for Simple Mail Transfer Protocol and is the standard for transferring e-mails on the Internet. To ensure that emails can be sent securely, users and systems must prove their identity to the SMTP server – this is done using SMTP authentication. In the past, “basic authentication” was used for this, where the user name and password were transmitted unencrypted or with only minimal protection.
Today, professional IT environments – especially Microsoft 365 – rely on “Modern Authentication” with OAuth 2.0which is token-based and significantly increases security. Microsoft switched off the outdated method in 2022/2023 to force companies to use more secure authentication.
SMTP authentication not only affects classic email clients such as Outlook or Thunderbird, but also scanners, printers or third-party systems that send emails via SMTP (e.g. invoices or notifications).
