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Using Send an Email and From (Send As) yields permission error to mailbox but have granted Send As in Exchange

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Posted on by luvsql

I have a flow that I've changed the Connection to be another Exchange Account (noreply@company.com) which is licensed and not a shared mailbox. I have gone into Exchange and added my test user account as a delegate to this noreply account with "Send As" permissions. When I trigger the flow as my test user, I receive an error on the flow "You are not authorized to send mail on behalf of the specified sending account."

But this user DOES have Send As permissions on the sending account ie test account, which is setup as the "From (Send As)" has Send As permissions on the noreply account, which is setup as the Connector. I have even waited 48 hours thinking it might be a propagation issue.

I cannot use a shared mailbox because I need the "From (Send as)" box which isn't available on that one.

Basically, I simply want the email to show as from the person that triggered the flow since we're sending these types of flow emails to different mailboxes and departments. They must see in their inbox WHO it came from so they can reply in Outlook vs all of the emails coming from single account, which is not helpful. This was supposed to be the only way we can do this ie adding Send As delegate access but this isn't working either.

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Ellis Karim 11,681 Super User 2025 Season 2 on at

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To Send As: try adding the Read and manage permissions:
You should then be able to use a Shared Mailbox (and save an MS 365 license!) and send as that shared mailbox e.g. IT Invoices example below:

However, you have a very different requirement here:
Basically, I simply want the email to show as from the person that triggered the flow since we're sending these types of flow emails to different mailboxes and departments. They must see in their inbox WHO it came from so they can reply in Outlook vs all of the emails coming from single account, which is not helpful. This was supposed to be the only way we can do this ie adding Send As delegate access but this isn't working either.

You can configure the flow to use the Outlook connection of the user running the flow so emails that are sent using the "run time user's" Outlook connection. See the example below for a run only user called Alex:

Ellis
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luvsql 67 on at

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Okay I will try all of these! So long as the email when it is received shows as the user that triggered the flow, that might work.

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luvsql 67 on at

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The emails are still showing in the receipient's Inbox as "from" the shared mailbox so this isn't going to work. I will try the other option.

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luvsql 67 on at

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I don't see the manager run-only user options on my flow. From what I read it only works if you have "The "Manage Run-Only User" would only support in the flow with trigger "Manually trigger a flow" or "For a selected item"" and I don't have either of those.

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Ellis Karim 11,681 Super User 2025 Season 2 on at

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Yes, you are correct 😢. As mentioned in Manage owners and users in your Microsoft list flows with Power Automate:

Flows in Power Automate let you share your flows with others as owners or run-only users.
Owners can modify flows, whereas run-only users can run or execute flows.
Users' ability to run flows depends entirely on the trigger, specifically:
* For a selected item
* For a selected file

Ellis

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luvsql 67 on at

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We can't used Shared mailboxes and can't use the run-only and the granting of Send As to an account also doesn't work, so basically it comes down to Power Automate can only send SharePoint data from ONE account to ONE account, and that is it. Basically a user that submits data can't send data. Sending an Outlook form has more functionality.

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