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Per our superiors, here is the reason why it happened:
"Amazon made a change about the bounces API so our system was not adding
all bounces to the bounce list correctly for a while, we learned about this when all of this started and that's why our bouncing system added hundreds of emails to the bounce list in the same day."
This is now fixed
We do apologize for the inconvenience. Let us know if the problem persists. Thanks!