Hello @PaulaJ34 ,
I got the contacts unsuspended in our system administratively. As a follow-up, I'd recommend doing a Quicksend of the last email they were supposed to receive. If we receive a report from their domain / ISP about them being 'non-existent' again, then they'll likely be put back into suspension. You can check this by going to the contact's engagement history right after doing the Quicksend.
If the non-existent bounce occurs again, then it may be worth reaching out to our Delivery team to see if they have any additional insight regarding that domain / ISP.
See also:
Managing and Removing Bounces
The Suspended Bounce Category
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