To enable SMTP relay in your Office 365 account settings and configure the necessary authentication credentials, you'll need to access the Exchange Admin Center (EAC) or the Microsoft 365 admin center. Here's a general guide on how to do this:
Sign in to Office 365 Admin Center:
Go to https://admin.microsoft.com and sign in with your Office 365 administrator credentials.
Access Exchange Admin Center (EAC):
In the Microsoft 365 admin center, go to the "Admin centers" section.
Click on "Exchange" to open the Exchange Admin Center (EAC).
Navigate to Send connectors:
In the EAC, go to "Mail flow" from the left-hand navigation menu.
Select "Send connectors" tab.
Create a new Send connector (if necessary):
If there's no existing Send connector for SMTP relay, you may need to create a new one by clicking on the "+" icon or the "New" button.
Follow the prompts to create a new Send connector. You'll need to specify the connector type as "Custom" and configure the settings accordingly. Make sure to specify the SMTP server address and port (typically smtp.office365.com:587).
Configure Authentication:
While creating or editing the Send connector, you'll have the option to configure authentication settings.
Typically, you'll need to select "Basic Authentication" and provide the username and password of an Office 365 mailbox that has the necessary permissions to send emails via SMTP relay. Make sure to use a dedicated mailbox for this purpose for security reasons.
Enable SMTP Relay:
Ensure that the Send connector you created or configured has the appropriate settings to enable SMTP relay.
Check any additional settings related to message delivery restrictions, address space, and TLS encryption as per your requirements.
Save Changes:
Once you've configured the Send connector with the necessary settings, save your changes.
Test SMTP Relay:
After configuring SMTP relay, it's a good idea to test it to ensure that emails can be successfully relayed through the SMTP server. You can use a simple script or a testing tool to send a test email through your SMTP relay configuration.
By following these steps, you should be able to enable SMTP relay in your Office 365 account settings and configure the necessary authentication credentials for sending emails via SMTP. If you encounter any issues or need further assistance, you can refer to Microsoft's documentation or contact Office 365 support for help.