How to Send SharePoint Files in the Same Email Thread with Power Automate
Question details
The user wants to use Power Automate or Logic Apps to send newly created SharePoint files as replies in an existing email conversation instead of generating a brand new thread.

- Product
- SharePoint, Power Automate
- Device & OS
- not provided
- Scenario
- Automating document sharing workflows where new SharePoint files need to be distributed to stakeholders without fragmenting the email communication into multiple separate threads.
- Observed behavior
- By default, standard email actions may create a new conversation thread. The flow needs to be specifically configured to preserve the existing conversation or message identifier.
Ensure you have access to Microsoft Power Automate, the necessary permissions to your target SharePoint site, and the original email's message identifier you wish to reply to.
Configure Power Automate Flow for Email Threading
Set up a flow using the SharePoint trigger and configure the email action properties to reply to an existing thread by mapping the correct message identifiers.
To ensure an automated email is grouped into an existing conversation, the email client needs to recognize the 'Message-ID' or 'In-Reply-To' properties. You must design your flow to capture and reuse this identifier.
Navigate to Power Automate and create a new automated flow. Select the 'When a file is created (properties only)' SharePoint trigger to initiate the workflow.
Use a preceding action (such as 'When a new email arrives') or a data store to capture and provide the original email's 'Message-ID' or 'Conversation Id' to your flow.
Add the 'Reply to email (V2)' or a similarly configured custom HTTP email action. Map the retrieved Message-ID to the appropriate field to ensure the connector preserves the conversation threading.

Submit a Support Request via Microsoft 365 Admin Center
If you hold a Microsoft 365 Business license, an administrator can request direct technical assistance from Microsoft for advanced flow configuration.
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- 1. Download WPS Office: Visit the official WPS website and download the free installation package for your operating system.
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Frequently Asked Questions
Why do my Power Automate emails start a new thread instead of replying?
Email clients use headers like 'Message-ID' and 'In-Reply-To' to group emails into a conversation. If your flow's email action doesn't specify or correctly format these identifiers, the recipient's email client will treat the message as a brand new thread.
Can I use Logic Apps to send SharePoint files in an existing email thread?
Yes, Azure Logic Apps uses the same underlying connectors as Power Automate. You can configure Logic Apps using similar triggers and email actions to preserve the conversation identifier.
Where can I get help designing complex Power Automate flows?
For advanced design guidance and troubleshooting regarding connectors and message properties, the Microsoft Power Platform Community is the best resource to consult with other experts.




