![]() ![]() ![]() Use an on-premises email server (Exchange Server or any other SMTP server) to relay mail if your device is unable to meet the previous requirements for connecting to Microsoft 365 or Office 365.Depending on your requirements, use direct send (Option 2) or Opt in to the Exchange Online endpoint for legacy TLS clients using SMTP AUTH.If your device or application doesn't support TLS 1.2 or above, you have the following alternatives: Transport Layer Security (TLS) and other encryption optionsĭetermine what version of Transport Layer Security (TLS) your device supports by checking the device guide or with the vendor. As long as your scenario meets the requirements for SMTP AUTH client submission, the following settings will enable you to send emails from your device or application: Device or Application settingĮnter the sign-in credentials of the hosted mailbox being used ![]() How to set up SMTP AUTH client submissionĮnter the following settings directly on your device or in the application as their guide instructs (it might use different terminology than this article). The email address of the account that's used to authenticate with Microsoft 365 or Office 365 will appear as the sender of messages from the device or application. To configure your device or application, connect directly to Microsoft 365 or Office 365 using the SMTP AUTH client submission endpoint .Įach device or application must be able to authenticate with Microsoft 365 or Office 365. You want to send emails to people inside and outside your organization.You want to send emails from a third-party hosted application, service, or device.This option supports most usage scenarios and is the easiest to set up. For more information, see Enable or disable authenticated client SMTP submission (SMTP AUTH) in Exchange Online. SMTP AUTH is disabled for organizations created after January 2020 but can be enabled per-mailbox. You must also verify that SMTP AUTH is enabled for the mailbox being used. For more information about OAuth, see Authenticate an IMAP, POP or SMTP connection using OAuth. As a result, there are no plans to disable Basic Authentication for SMTP AUTH clients at this time. Although SMTP AUTH now supports OAuth, most devices and clients haven't been designed to use OAuth with SMTP AUTH. We recommend using Modern Authentication when connecting with our service. This option isn't compatible with Microsoft Security Defaults. ![]()
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