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.
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