I have a question about how email bounces are treated in ACS.
I was of the understanding that if an email address hard bounced, it was automatically then added to the Quarantined list. Does anyone know if this is the case simply after one hard bounce, or is the logic set to more than one?
The reason I ask the question is because I have been analyzing some bounce reports and I've come across the following scenario where two contacts, both who bounced with exactly the same bounce error have been treated differently.
Contact A was emailed on 22/02 - This was the first email to this profile. The email bounced with an Error of User Unknown - a hard bounce. This contact is not present on the Quarantined list.
Contact B was email on 26/02 - This profile has been emailed multiple times but this is the first time an email has bounced. The error state was User Unknown - a hard bounce. This contact is present on the Quarantined list.
Can anyone explain why the two would be treated differently?