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Dan Stevens, Good question!
The issue resulted from a change that was made in our servers in one data center. That change was implemented at ~6:30pm PT Wed 17th, problem was fixed at ~5am PT Wed 18th. So, only that time frame would have seen the soft bounces.
Also, since this only affected one data center, the scope of the impact is pretty limited. Run a quick email performance report for the last two days and if there isn't a spike in soft bounces, it wouldn't have affected your instance.