This guide shows you how to troubleshoot high bounces for your transactional sends.
Identifying high bounces
You can also see the bounce trends in the bounce over time graph:
You can investigate whether the bounces are coming from multiple mailbox providers or a single mailbox provider using the Deliverability Report and filtering by Transactional campaigns:
If you experience a sudden increase in soft bounces or frequently high soft bounces, you should raise a request to the Deliverability Team for help.