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Correct answer by
Community Advisor

Hi,

 

Email Unknown Error - It is a hard bounce, which occurs when email address is incorrect. 

Regarding Tracking Log data:

It’s likely asynchronous feedback loop ( for ex: Customer marked the email as spam ) that changed the status of broadlog to failed from sent. Please check if the records you’re seeing are also in nms:Address table to confirm this.

 

Thanks.

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