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. SMTP AUTH supports modern authentication (Modern Auth). The SMTP AUTH protocol is used for client SMTP email submission, typically on TCP port 587. For more information, see Authenticate an IMAP, POP or SMTP connection using OAuth. Applications, reporting servers, and multifunction devices that generate and send email messages.Īs of February 2020, OAuth authentication is available for POP3, IMAP4, and SMTP AUTH connections to Exchange Online.These protocols only allow clients to receive email messages, so they need to use authenticated SMTP to send email messages. Enable or disable authenticated client SMTP submission (SMTP AUTH) in Exchange OnlineĬlient SMTP email submissions (also known as authenticated SMTP submissions) are used in the following scenarios in Office 365 and Microsoft 365:
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