Phantomers other auth1/19/2024 Note: To enable SMTP AUTH if it's already disabled, use the value $false. To disable SMTP AUTH globally in your organization with PowerShell, run the following command: Set-TransportConfig -SmtpClientAuthenticationDisabled $true To disable SMTP AUTH globally in your organization in the new EAC, go to the Mail Flow settings page under Settings and toggle the setting labeled "Turn off SMTP AUTH protocol for your organization" You can disable (or enable) SMTP AUTH globally for your organization in the new EAC or by using Exchange Online PowerShell. For more information, see Disable Basic authentication in Exchange Online. If your authentication policy disables basic authentication for SMTP, clients cannot use the SMTP AUTH protocol even if you enable the settings outlined in this article.For more information, see What are security defaults?. If security defaults is enabled in your organization, SMTP AUTH is already disabled in Exchange Online.Note that these settings only apply to mailboxes that are hosted in Exchange Online (Office 365 or Microsoft 365). A per-mailbox setting that overrides the tenant-wide setting.An organization-wide setting to disable (or enable) SMTP AUTH.There are two settings that can help you do this: Therefore, we highly recommend that you disable SMTP AUTH in your Exchange Online organization, and enable it only for the accounts (that is, mailboxes) that still require it. Virtually all modern email clients that connect to Exchange Online mailboxes in Office 365 or Microsoft 365 (for example, Outlook, Outlook on the web, iOS Mail, Outlook for iOS and Android, etc.) don't use SMTP AUTH to send email messages. For more information, see Authenticate an IMAP, POP or SMTP connection using OAuth. SMTP AUTH supports modern authentication (Modern Auth) through OAuth in addition to basic authentication. The SMTP AUTH protocol is used for SMTP client email submissions, typically on TCP port 587.
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