This article explains why emails sent using the built-in Microsoft 365 (M365) email provider are not appearing in the mailbox Sent Items folder. When using the default Branding email provider configuration, the system does not explicitly pass the flag required to save a copy of the message to the sender's mailbox.

• Microsoft 365
• Branding
• Email Provider
• Microsoft Graph API

The pre-built M365 integration is designed for a standardized configuration and does not currently expose or enable the saveToSentItems flag by default. Because this flag is not set to true internally during the API call, the Microsoft Graph API does not move the sent message to the Sent Items folder.

To gain control over the email payload and enable the saveToSentItems flag, configure a Custom Email Provider. 

1. Navigate to the dashboard to begin the configuration. 
2. Set up a Custom Email Provider to interface with the Microsoft Graph API. 
3. In the custom integration logic, explicitly set the saveToSentItems parameter to true.
4. Test the configuration in a non-production environment to verify that emails appear in the Sent Items folder.

NOTE: To request this toggle be added to the standard M365 configuration, please submit a feature request.