When reviewing your Marketing Cloud tracking information, you may see that the domain that bounced is different than that of the original subscriber.
An email that is forwarded on or BCC/CC'ed includes the original Return-Path (Bounce) address in the header of the email. So if the forwarded subscriber or BCC/CC'ed address bounces the email, the bounce is returned back to our system and is tied to that original subscriber.
For more information, Click Point Your Custom Domain to Your Salesforce Org.
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