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If your organization uses multiple domain names, enter any of the domains. By verifying that the subject name on the certificate that the sending server uses to authenticate with Office 365 matches the domain entered in the text box below.Įnter the domain name used by your organization.Choose how Office 365 should authenticate and accept an email sent from your server. Retain internal Exchange email headers (recommended)Īuthenticating sent email.Select what to do after the connector is saved: Enter the connector name, for example, Office 365 SMTP relay TLS.Įnter a description for the SMTP connector, for instance:Ī connector from the on-premises email server to Office 365 Hit Next at each step of the wizard to continue.Ĭonnector name. This default option is selected automatically when you select the Your organization’s email server radio button. Under Connection to, Office 365 is greyed out. Select Your organization’s email server under Connection from. If you have previously created connectors, they should appear on this page.Ĭlick + Add a connector on the Connectors page to add an SMTP connector. In my example, the list is empty because no connectors have been created yet. Go to Mail flow > Connectors in the navigation pane to open Office 365 SMTP relay settings. Let’s configure an Office 365 connector for the SMTP relay from your email server to Office 365. Using a Connector from Your Mail Server to Office 365 You can configure Office 365 connectors for the mail flow between Office 365 and your on-premises Exchange server. You can set up connectors in Office 365 to route email between Office 365 and your own email servers in both directions. What are Office 365 Connectors?Īn Office Connector is a collection of instructions used to customize how email flows to and from your Office 365 organization. Read also the blog post about Office 365 SMTP settings. The account must belong to the Organization Management group. Your Office 365 account must have enough permissions for editing the configuration of Exchange Online.Incoming connections from IP addresses of Office 365 servers must be allowed.Email servers connect to remote email servers on port 25.This limit is set to prevent sending spam. 1,500 messages per day can be sent from one Office 365 account.The account that authenticates on the relay server must be the same as the address from which messages are sent through the relay.When you purchase a CA-signed certificate, your domain is validated, and there’s proof that you control the domain.Īdditional requirements and limitations are:
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CA-signed certificates are automatically trusted by web browsers and other applications. The advantage of using certificates issued by trusted certificate authorities is the ability to authenticate the identity of the certificate’s owner. It is recommended that you use a certification authority-signed (CA-signed) certificate whose name includes the domain name matching the domain name used by your organization’s email server.
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The sending application (the on-premises email server) must support TLS, connect to the Office 365 servers on port 587 (the SMTP port for Office 365 with encryption enabled), and authenticate with Office 365. This blog post explains Office 365 SMTP relay and configuration basics. You may need to use Office 365 SMTP relay if you are going to send a bulk email (for a marketing campaign, for example) and route email through a trusted third-party server that provides a high level of security. Other use cases for SMTP relay include sending automated email messages from a device or developed application and improving email deliverability. You may need to keep the on-premises email server for several reasons, including for internal company communication without an internet connection, for higher storage limits for users’ mailboxes, or the number of daily emails exceeds the Office 365 daily limit. An SMTP relay is used when you need a higher level of anti-spam and antivirus protection for incoming emails compared to your on-premises email server, but you cannot move to Microsoft email servers only. In general, if you use Office 365, you don’t need to configure an SMTP relay to send email messages. What are SMTP relays? An SMTP relay is a service for transferring emails from one mail server to another. Sometimes the functionality of a single SMTP server may be not enough, and you may need to configure an SMTP relay. An SMTP server is responsible for sending outgoing emails. Simple Mail Transfer Protocol (SMTP) is the standard protocol for sending emails. By Michael Bose Setting Up an Office 365 SMTP Relay with TLS Connectors