Sending auto replies from a shared mailbox and forwarding same email to another shared mailbox

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Posted on by EC-01081752-0

Hello,

I am new to Power Automate and was trying to build a flow but having issues with non delivery emails from Microsoft.

The flow works when I test it, but later on I start to see these non delivery emails from Microsoft is both shared mailboxes

The flow is setup that when a vendor sends an email to shared mailbox "A". Shared mailbox "A" then forwards the email to Shared Mailbox "B". Also Shared Mailbox "A" sends and auto reply to the vendor stating the changes made and shared mailbox "A" will later be replaced with shared mailbox "B". All the steps work, but then after a while a bunch of non delivery emails start to flood the shared mailboxes. I tried a few things listed below, but not sure if that is where the issues lies.

In the Send an email from a shared mailbox step 2, in the "To" field I have tried different things. The first thing was the dynamic content "From"

I have also tried using the expression triggerOutputs()?['body/from'] and triggerOutputs()?['body/from/emailAddress/address'] , but still getting non delivery emails from Microsoft

Thank you!

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Building flows

TriggerOutputs.png

From field.png

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trice602 15,404 Super User 2025 Season 2 on at

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Hi there!

Even though your expression looks correct, I suspect there's an issue with it. In short, you don't need to write an expression, just use the dynamic content from the trigger. Also, to be more/faster responses, paste your images directly in your posts vs adding attachments.

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EC-01081752-0 8 on at

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Thank you for the response!

Unfortunately, there were other issues with the auto-response email being bounced back as undeliverable. As many auto generated emails were sending emails to the shared mailbox, then the shared mailbox would auto respond to the example (NoReplyEmail) the undeliverable emails would loop and the shared mailbox would get flooded with undeliverable emails till someone went in the shared mailbox and deleted them, and the loop would stop. There would also be loops of emails if one shared mailbox with an auto reply would email another shared mailbox with auto reply. Lots of issues with my flows, so I just decided to make rules in the web version of the shared mailboxes and that seemed to work. Thanks again. This was my first time using Microsoft Flows, so I could probably use some more experience using this tool.

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