Track Undeliverables mails inside a mailbox

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Posted on by VK-25071541-0

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Dear Community,

I have an unmonitored shared mailbox that has some undelivered emails. Is it possible to get info from the emails to whom the delivery failed from all those emails?

Body:

Your message to def@blxvc.com couldn't be delivered.

def wasn't found at blxvc.com.

Subject- Undeliverable: Notice of

Thanks

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Building flows

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Michael E. Gernaey 53,963 Moderator on at

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Hi @VK-25071541-0

Totally do able.

You could setup a trigger on incoming emails.

You could setup a trigger condition on Subject and or Body to check if the words couldn't be delivered are there

Then you grab who the original receipients were from the mail dynamic properties,

Then email yourself or log it somewhere.

If this answers your question, please mark as such and maybe a like.

If you need help building it, please start another question thread for building it out.

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VK-25071541-0 116 on at

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Hi @Michael E. Gernaey , we have used when an email arrives V2 trigger but it doesn't always get hit Rather once in a while it is getting hit. Not sure the cause. should The connection to create flow and shared mailbox be different?

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VictorIvanidze 13,081 on at

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Hi @VK-25071541-0,

modify the trigger this way and it will work reliably:

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David_MA 14,597 Super User 2026 Season 1 on at

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I am not sure if this is what you're asking, but this is how I handle undeliverable e-mails to a shared mailbox:

Use the trigger When a new mail arrives in a shared mailbox.

Add a trigger condition so it triggers only on undeliverable messages. For my use case, that is:

@contains(triggerOutputs()?['body/subject'],'Undeliverable:')

Then I use the Forward an email action to forward the message to the person/group who should be notified.

The flow is this simple:

The compose action is just to make it easier to view information from flow runs.

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David_MA 14,597 Super User 2026 Season 1 on at

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P.S. To get the e-mail address, you could try an expression like this on the body of the e-mail:

substring(outputs('Html_to_text')?['body'], add(indexOf(outputs('Html_to_text')?['body'], 'Your message to '), 14), sub(indexOf(outputs('Html_to_text')?['body'], ' couldn''t be delivered.'), add(indexOf(outputs('Html_to_text')?['body'], 'Your message to '), 14)))

Note, I have not tested this, and it requires that the string always follows this pattern: Your message to e-mail.address@domain.com couldn't be delivered. You will also need to run the body of the e-mail through the HTML to text (preview) action.

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