Microsoft 365 or Office 365 SMTP relay uses a connector to authenticate the mail sent from ...
SMTP Settings. Microsoft 365. Outlook. Hotmail. Live.com. Server: outlook.office365.com. Port: ...
How to Set Up Office 365 SMTP Settings Using the SMTP Client Submission Method. Once you log in to the Microsoft Outlook mail app, use the toolbar and navigate to File > Account Settings > Server Settings. Then, click on Outgoing Mail to set up your SMTP Outgoing Server settings.
To configure your device or application, connect directly to Office 365 using the SMTP client submission endpoint smtp.office365.com. Each device/application must be able to authenticate with Office 365. It can have its own sender address, or all devices can use one address, such as firstname.lastname@example.org.
Office 365 SMTP Settings. With the settings above you will have a sending limit of 10,000 emails per day and 30 messages per minute. Which should be more than efficient for most use cases. If you need more you will need to use the SMTP Relay.
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For business users, Office 365 offers service plans providing e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, and integration with Yammer, as well as access to the Microsoft Office software.
SMTP AUTH supports modern authentication (Modern Auth). 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. 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.
Mandatory requirements for SMTP Relay with Office 365. The sending app must connect to the Office 365 servers on port 587; The application which you are using for sending the emails must support TLS; The sending app must authenticate with Office 365. The “SMTP relay server” that wants to relay mail to the Office 365 mail infrastructure will need to provide credentials (username + password) using the basic authentication protocol.