Hello @HeatherJ38 ,
You can unsuspend a suspended bounced contact once through an email's bounce report. Otherwise you can reply to the automated @ mention email you receive from this response, with the contact's email address, and we'll try to unsuspend them administratively.
Once unsuspended, 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 / suspended bounce occurs again for the viable contact, then it may be worth reaching out to our Delivery team to see if they have any additional insight regarding that domain / ISP.
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