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Transport Rule Bouncebacks not working outside of Domain

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I've recently have implemented a bounce back rule to block zip files from entering our environment. The block seems to work great but I have noticed that the bounceback messages notifying the user of the block does not work outside of the domain.


If I send myself an email internally the bounceback works immediately.

My message tracking logs shows a Failure under SouceContext and EventID and Source are both DSN.


Where do I start with this?


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