Comparing Different Methods for Relaying Emails Through Microsoft Exchange Online

Microsoft offers multiple methods for sending emails from multifunction devices or applications to users on the Internet via Microsoft 365 or Office 365. This page compares these methods based on functionality and ease of configuration. Refer to How to set up a multifunction device or application to send email using Microsoft 365 or Office 365 | Microsoft Learn for details about these methods.

In short, they offer the following 3 methods:

1. Using SMTP Authentication via OAuth. Details...
2. Setting inbound connector, which can use a client-side SSL certificate, or a static IP. Details...
3. Direct send. Click here for details. This method assumes you want to relay emails. However, you don't have to relay through Microsoft when using this method. Read below for further details.

Comparing These Methods