Send & Receive Issues

How to Set a Specific Sender Address in Power Automate Outlook Flows

Natalie Taylor Oct 15, 2026 869 views

Question details

User needs to know how to configure a Power Automate flow to send Outlook messages or create events from a designated sender address instead of the connected user's default mailbox.

How to Set a Sender Address in a Power Automate Outlook Flow

Product: Microsoft Power Automate, Microsoft Outlook
Device & OS: not provided
Scenario: Automating Outlook event creation and email dispatching from a SharePoint list, requiring the sender to be a specific alias or default address rather than the creator's personal email.
Observed behavior: Automated Outlook events and emails are sent from the personal email address of the user who configured the connection, lacking the ability to use external addresses directly.

Before you start

Ensure you have administrative access to your Microsoft 365 Exchange admin center to assign 'Send As' or 'Send on Behalf' permissions for the internal mailboxes you plan to use.

Solution 1Recommended

Use an Internal Mailbox with 'Send As' Permissions

Configure the flow to use a shared or internal mailbox where your connected account has the appropriate 'Send As' delegation.

Power Automate cannot send mail as an external user through Send As delegation. You must use an internal mailbox within your organization's tenant that has the required permissions.

Verify Mailbox Permissions

Ensure your Microsoft 365 account has 'Send As' or 'Send on Behalf' permissions for the target internal mailbox. This can be configured in the Microsoft 365 Exchange admin center.

Add Outlook Action

In your Power Automate flow, add the 'Send an email (V2)' or 'Create event (V4)' action under the Office 365 Outlook connector.

Show Advanced Options

Click on 'Show advanced options' at the bottom of the email or event action card to reveal additional configuration fields.

Set the From Field

Enter the exact email address of the internal mailbox you have permissions for in the 'From (Send as)' field.

Use an Internal Mailbox with 'Send As' Permissions

Permission Sync Delay: If you were just granted 'Send As' permissions by an administrator, it may take up to 24 hours for the changes to fully propagate across Microsoft 365 services.

Solution 2

Use a Third-Party Mail Connector via OAuth

If you need to send emails from an external address (such as Gmail), utilize a dedicated third-party mail connector instead of the standard Outlook connector.

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Frequently Asked Questions

Why are my Power Automate emails always sent from my personal address?

By default, Power Automate uses the credentials of the account connected to the Outlook action. You must specify a different address in the 'From (Send as)' field and possess the correct permissions to change the sender.

Can I send an email as an external user in an Outlook flow?

No, you cannot use 'Send As' delegation for an external user's email address in the standard Office 365 Outlook connector. You must use a specific third-party connector (like Gmail) and authenticate with OAuth.

How do I get 'Send As' permissions for a shared mailbox?

Your Microsoft 365 administrator needs to grant you 'Send As' permissions for the shared mailbox through the Exchange admin center or Microsoft 365 admin portal. Once granted, you can use that address in the 'From' field of your flow.

Outlook & Email Problems