Upcoming Sparkpost 2018 changes

Sparkpost is making some changes to their endpoints.

SMTP

Current: return a ‘250 Ok’ and ‘policy rejection’ event (no injection event)
Future: return a ‘250 Ok’ with ‘injection’ event followed by a ‘bounce’ event
REST API

Single recipient transmission

Current: return a 400 with special error message, followed by a ‘generation rejection’ event
Future: return a 200 with an ‘injection’ event followed by a ‘bounce’ event

Multiple recipient transmission

Current: return a 200 followed by a ‘generation rejection’ event (no injection event)
Future: return a 200 with an ‘injection’ event followed by a ‘bounce’ event

I have looked at the code and didn't see anything that would cause issues. Does anyone see anything that would cause issues?