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“Basic Auth" or “basic authentication” appears to mean means authentication with only a user name and password. See What is “SMTP AUTH”SMTP AUTH? below.
Today, we are announcing that, effective October 1, 2022, we will begin to permanently disable Basic Auth in all tenants, regardless of usage, with the exception of SMTP Auth.
… IMPORTANT: Sometime in second and third quarters of 2022 we will selectively pick tenants and disable Basic Auth for all affected protocols except SMTP AUTH for a period of 12-48 hours. After this time, Basic Auth for these protocols will be re-enabled, if the tenant admin has not already re-enabled them using our self-service tools.
– https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-may-2022/ba-p/3301866
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SMTP_AUTH SMTP_AUTH
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https://docs.microsoft.com/en-us/powershell/exchange/app-only-auth-powershell-v2?view=exchange-ps Exchange Online PowerShell, |
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