Enable or disable SMTP AUTH in Exchange Online | Microsoft …
https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission
WebFeb 22, 2023 · The SMTP AUTH protocol is used for SMTP client email submissions, typically on TCP port 587. SMTP AUTH supports modern authentication (Modern Auth) through OAuth in addition to basic authentication. For more information, see Authenticate an IMAP, POP or SMTP connection using OAuth.
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